{"id":85316,"date":"2021-01-20T16:43:44","date_gmt":"2021-01-20T15:43:44","guid":{"rendered":"https:\/\/groupe-reussite.fr\/?page_id=85316"},"modified":"2026-10-22T07:51:01","modified_gmt":"2026-10-22T06:51:01","slug":"cours-en-ligne-arithmetique-seconde","status":"publish","type":"page","link":"https:\/\/groupe-reussite.fr\/ressources\/cours-en-ligne-arithmetique-seconde\/","title":{"rendered":"Cours arithm\u00e9tique seconde en ligne"},"content":{"rendered":"<div class=\"Latex_page\"><\/div>\n<div><\/div>\n<div class=\"Latex_page\">\n<section class=\"has_ae_slider elementor-element elementor-section-full_width elementor-reverse-mobile elementor-section-stretched elementor-section-height-default elementor-section-height-default ae-bg-gallery-type-default elementor-section elementor-top-section\">\n<div class=\"elementor-container elementor-column-gap-no\">\n<div class=\"elementor-row\">\n<div class=\"elementor-column-wrap elementor-element-populated colone_elementor\">\n<p style=\"text-align: justify;\">\t\t<div data-elementor-type=\"page\" data-elementor-id=\"88472\" class=\"elementor elementor-88472\">\n\t\t\t\t\t\t<section class=\"has_ae_slider elementor-section elementor-top-section elementor-element elementor-element-e664302 elementor-section-content-bottom elementor-hidden-mobile wrap elementor-section-boxed elementor-section-height-default elementor-section-height-default ae-bg-gallery-type-default\" data-id=\"e664302\" data-element_type=\"section\" data-e-type=\"section\" id=\"sticky_sidebar\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"has_ae_slider elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-d5b7bab strick_col ae-bg-gallery-type-default\" data-id=\"d5b7bab\" data-element_type=\"column\" data-e-type=\"column\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-4b04bef elementor-headline--style-highlight elementor-widget elementor-widget-animated-headline\" data-id=\"4b04bef\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;highlighted_text&quot;:&quot;r\\u00e9ussir en maths&quot;,&quot;headline_style&quot;:&quot;highlight&quot;,&quot;marker&quot;:&quot;circle&quot;,&quot;loop&quot;:&quot;yes&quot;,&quot;highlight_animation_duration&quot;:1200,&quot;highlight_iteration_delay&quot;:8000}\" data-widget_type=\"animated-headline.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p class=\"elementor-headline\">\n\t\t\t\t\t<span class=\"elementor-headline-plain-text elementor-headline-text-wrapper\">Mon parcours pour<\/span>\n\t\t\t\t<span class=\"elementor-headline-dynamic-wrapper elementor-headline-text-wrapper\">\n\t\t\t\t\t<span class=\"elementor-headline-dynamic-text elementor-headline-text-active\">r\u00e9ussir en maths<\/span>\n\t\t\t\t<\/span>\n\t\t\t\t<\/p>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-533b999 elementor-position-inline-start elementor-view-default elementor-mobile-position-block-start elementor-widget elementor-widget-icon-box\" data-id=\"533b999\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"icon-box.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-icon-box-wrapper\">\n\n\t\t\t\t\t\t<div class=\"elementor-icon-box-icon\">\n\t\t\t\t<span  class=\"elementor-icon\">\n\t\t\t\t<i aria-hidden=\"true\" class=\"far fa-check-square\"><\/i>\t\t\t\t<\/span>\n\t\t\t<\/div>\n\t\t\t\n\t\t\t\t\t\t<div class=\"elementor-icon-box-content\">\n\n\t\t\t\t\t\t\t\t\t<p class=\"elementor-icon-box-title\">\n\t\t\t\t\t\t<span  >\n\t\t\t\t\t\t\tJ'aprends le cours par coeur\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/p>\n\t\t\t\t\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9d143f0 elementor-position-inline-start elementor-view-default elementor-mobile-position-block-start elementor-widget elementor-widget-icon-box\" data-id=\"9d143f0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"icon-box.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-icon-box-wrapper\">\n\n\t\t\t\t\t\t<div class=\"elementor-icon-box-icon\">\n\t\t\t\t<span  class=\"elementor-icon\">\n\t\t\t\t<i aria-hidden=\"true\" class=\"far fa-check-square\"><\/i>\t\t\t\t<\/span>\n\t\t\t<\/div>\n\t\t\t\n\t\t\t\t\t\t<div class=\"elementor-icon-box-content\">\n\n\t\t\t\t\t\t\t\t\t<p class=\"elementor-icon-box-title\">\n\t\t\t\t\t\t<span  >\n\t\t\t\t\t\t\tJe travaille avec un prof de maths\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/p>\n\t\t\t\t\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a86028c elementor-position-inline-start elementor-view-default elementor-mobile-position-block-start elementor-widget elementor-widget-icon-box\" data-id=\"a86028c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"icon-box.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-icon-box-wrapper\">\n\n\t\t\t\t\t\t<div class=\"elementor-icon-box-icon\">\n\t\t\t\t<span  class=\"elementor-icon\">\n\t\t\t\t<i aria-hidden=\"true\" class=\"far fa-check-square\"><\/i>\t\t\t\t<\/span>\n\t\t\t<\/div>\n\t\t\t\n\t\t\t\t\t\t<div class=\"elementor-icon-box-content\">\n\n\t\t\t\t\t\t\t\t\t<p class=\"elementor-icon-box-title\">\n\t\t\t\t\t\t<span  >\n\t\t\t\t\t\t\tJe travaille entre chaque s\u00e9ance\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/p>\n\t\t\t\t\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4b5aa0f elementor-align-center elementor-widget elementor-widget-button\" data-id=\"4b5aa0f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-lg\" href=\"https:\/\/groupe-reussite.fr\/cours-particuliers\/maths\/tous-niveaux\/france\/\" target=\"_blank\" id=\"CTA_PAGE_CHAPEAU\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Cours particuliers maths<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-bdaf46b elementor-widget elementor-widget-text-editor\" data-id=\"bdaf46b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p style=\"text-align: center;\"><b>Avis Google France\u00a0<br \/><\/b><span style=\"font-size: 17px; color: #e5a430;\"><b>\u2605\u2605\u2605\u2605\u2605<\/b><\/span><b style=\"font-size: 17px;\"> 4,8 sur 5<\/b><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t\n<\/div>\n<div class=\"elementor-column-wrap elementor-element-populated colone_latex\" style=\"text-align: justify;\">\n<div class=\"style_pag\" style=\"color: #000; font-family: 'Lato', Sans-serif;\">\n<div class=\"elementor-text-editor elementor-clearfix\" style=\"color: #000000; font-family: Lato, sans-serif;\">\n<h1 class=\"Latex_page_title\" style=\"text-align: center;\">Cours d&rsquo;arithm\u00e9tique en seconde : multiples, diviseurs, nombres pairs et impairs<\/h1>\n<p><em>Par Seda Biber, mis \u00e0 jour le 22\/10\/2026<\/em><\/p>\n<\/div>\n<p>L&rsquo;arithm\u00e9tique est la partie des math\u00e9matiques qui \u00e9tudie les nombres entiers et la fa\u00e7on dont ils se divisent les uns par les autres. En seconde, le programme en vigueur depuis la rentr\u00e9e 2026 vous demande de ma\u00eetriser les notations <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-bc8e16cdad5408a0b540d2bc0098bcfb_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#109;&#97;&#116;&#104;&#98;&#98;&#123;&#78;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"13\" style=\"vertical-align: 0px;\"\/> et <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-e1ac530f2a83951115df3e0daa67b801_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#109;&#97;&#116;&#104;&#98;&#98;&#123;&#90;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"12\" style=\"vertical-align: 0px;\"\/>, les notions de multiple, de diviseur, de nombre pair et de nombre impair, et de savoir \u00e9crire une fraction sous forme irr\u00e9ductible. Deux d\u00e9monstrations sont au programme : la somme de deux multiples de <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"\/> est un multiple de <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"\/>, et le carr\u00e9 d&rsquo;un nombre impair est impair.<\/p>\n<p>Ce r\u00e9sum\u00e9 reprend chaque notion avec une d\u00e9finition, une m\u00e9thode et un exemple corrig\u00e9. Il fait partie des <a href=\"https:\/\/groupe-reussite.fr\/ressources\/cours-en-ligne-maths-seconde\/\">cours en ligne de maths de seconde<\/a> de Groupe R\u00e9ussite.<\/p>\n<p class=\"colone_latex_ancres\" style=\"color: #000000; font-family: Lato, sans-serif; text-align: center;\"><a href=\"https:\/\/groupe-reussite.fr\/ressources\/cours-en-ligne-arithmetique-seconde\/\">R\u00e9sum\u00e9 de cours<\/a> <a href=\"https:\/\/groupe-reussite.fr\/ressources\/cours-en-ligne-exercices-corriges-arithmetique-seconde\/\">Exercices et corrig\u00e9s<\/a><\/p>\n<p class=\"colone_latex_ancres\" style=\"color: #000000; font-family: Lato, sans-serif; text-align: center;\"><a href=\"https:\/\/groupe-reussite.fr\/ressources\/cours-en-ligne-maths-seconde\/\">Cours en ligne de Maths en Seconde<\/a><\/p>\n<table class=\"table\" style=\"width: 100%; border-color: #0F2742; color: #0f2742; background: #ffffff;\">\n<tbody>\n<tr>\n<td style=\"background: #0F2742; color: #ffffff; border: 1px solid #0F2742; text-align: left;\"><strong>Notion<\/strong><\/td>\n<td style=\"background: #0F2742; color: #ffffff; border: 1px solid #0F2742; text-align: left;\"><strong>\u00c0 retenir<\/strong><\/td>\n<td style=\"background: #0F2742; color: #ffffff; border: 1px solid #0F2742; text-align: left;\"><strong>Exemple<\/strong><\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #0F2742;\"><strong><img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-bc8e16cdad5408a0b540d2bc0098bcfb_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#109;&#97;&#116;&#104;&#98;&#98;&#123;&#78;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"13\" style=\"vertical-align: 0px;\"\/> et <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-e1ac530f2a83951115df3e0daa67b801_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#109;&#97;&#116;&#104;&#98;&#98;&#123;&#90;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"12\" style=\"vertical-align: 0px;\"\/><\/strong><\/td>\n<td style=\"border: 1px solid #0F2742;\"><img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-bc8e16cdad5408a0b540d2bc0098bcfb_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#109;&#97;&#116;&#104;&#98;&#98;&#123;&#78;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"13\" style=\"vertical-align: 0px;\"\/> : entiers naturels 0, 1, 2\u2026 ; <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-e1ac530f2a83951115df3e0daa67b801_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#109;&#97;&#116;&#104;&#98;&#98;&#123;&#90;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"12\" style=\"vertical-align: 0px;\"\/> : entiers relatifs \u2026, \u22122, \u22121, 0, 1, 2\u2026<\/td>\n<td style=\"border: 1px solid #0F2742;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-ce7bd23c19c98581258d970424fef09d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#45;&#51;&#32;&#92;&#105;&#110;&#32;&#92;&#109;&#97;&#116;&#104;&#98;&#98;&#123;&#90;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"55\" style=\"vertical-align: -1px;\"\/> mais <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-77925a078fc3ad7c94f51503ac8d5536_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#45;&#51;&#32;&#92;&#110;&#111;&#116;&#105;&#110;&#32;&#92;&#109;&#97;&#116;&#104;&#98;&#98;&#123;&#78;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"56\" style=\"vertical-align: -5px;\"\/><\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #0F2742;\"><strong>Multiple<\/strong><\/td>\n<td style=\"border: 1px solid #0F2742;\"><img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"\/> est un multiple de <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-f56d50c26583f9a035ff6b4e3c0ca5c0_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#98;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"8\" style=\"vertical-align: 0px;\"\/> s&rsquo;il existe un entier <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-3422b6bb5c160593658b7c39425d9880_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#107;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"9\" style=\"vertical-align: 0px;\"\/> tel que <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-33d94e537d0f7ee2ecf5161bc320877d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;&#32;&#61;&#32;&#107;&#98;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"51\" style=\"vertical-align: 0px;\"\/><\/td>\n<td style=\"border: 1px solid #0F2742;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-1792cbffb7acd95ce24d79027a5cf37f_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#52;&#50;&#32;&#61;&#32;&#54;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#55;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"81\" style=\"vertical-align: 0px;\"\/> : 42 est un multiple de 7<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #0F2742;\"><strong>Diviseur<\/strong><\/td>\n<td style=\"border: 1px solid #0F2742;\">si <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-33d94e537d0f7ee2ecf5161bc320877d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;&#32;&#61;&#32;&#107;&#98;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"51\" style=\"vertical-align: 0px;\"\/> avec <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-ec62276a9bce8f24170cfe968628306d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#98;&#32;&#92;&#110;&#101;&#113;&#32;&#48;\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"40\" style=\"vertical-align: -4px;\"\/>, <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-f56d50c26583f9a035ff6b4e3c0ca5c0_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#98;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"8\" style=\"vertical-align: 0px;\"\/> est un diviseur de <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"\/><\/td>\n<td style=\"border: 1px solid #0F2742;\">7 est un diviseur de 42<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #0F2742;\"><strong>Nombre pair<\/strong><\/td>\n<td style=\"border: 1px solid #0F2742;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-6e6a566793afcb732482cd68f2d360d7_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#110;&#32;&#61;&#32;&#50;&#107;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"52\" style=\"vertical-align: 0px;\"\/> avec <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-3422b6bb5c160593658b7c39425d9880_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#107;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"9\" style=\"vertical-align: 0px;\"\/> entier<\/td>\n<td style=\"border: 1px solid #0F2742;\">0, 18 et \u22126 sont pairs<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #0F2742;\"><strong>Nombre impair<\/strong><\/td>\n<td style=\"border: 1px solid #0F2742;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-1d2a57c44e9471b9c667edd32a771c27_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#110;&#32;&#61;&#32;&#50;&#107;&#32;&#43;&#32;&#49;\" title=\"Rendered by QuickLaTeX.com\" height=\"14\" width=\"83\" style=\"vertical-align: -2px;\"\/> avec <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-3422b6bb5c160593658b7c39425d9880_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#107;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"9\" style=\"vertical-align: 0px;\"\/> entier<\/td>\n<td style=\"border: 1px solid #0F2742;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-36597e02dbf44dc23626649af3583d52_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#55;&#32;&#61;&#32;&#50;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#51;&#32;&#43;&#32;&#49;\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"102\" style=\"vertical-align: -2px;\"\/><\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #0F2742;\"><strong>Somme de multiples<\/strong><\/td>\n<td style=\"border: 1px solid #0F2742;\">si <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-6b41df788161942c6f98604d37de8098_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#109;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"15\" style=\"vertical-align: 0px;\"\/> et <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-b170995d512c659d8668b4e42e1fef6b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#110;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"11\" style=\"vertical-align: 0px;\"\/> sont des multiples de <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"\/>, <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-f7f5ff24db011fb695802c7a5e40bde4_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#109;&#32;&#43;&#32;&#110;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"48\" style=\"vertical-align: -2px;\"\/> aussi<\/td>\n<td style=\"border: 1px solid #0F2742;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-1be3a4cecbe205be183ce7482994861e_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#50;&#49;&#32;&#43;&#32;&#51;&#53;&#32;&#61;&#32;&#53;&#54;&#32;&#61;&#32;&#55;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#56;\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"162\" style=\"vertical-align: -2px;\"\/><\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #0F2742;\"><strong>Carr\u00e9 d&rsquo;un impair<\/strong><\/td>\n<td style=\"border: 1px solid #0F2742;\">si <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-b170995d512c659d8668b4e42e1fef6b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#110;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"11\" style=\"vertical-align: 0px;\"\/> est impair, <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-a715fc0f84b8bee4928e92097d5eabfc_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#110;&#94;&#50;\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"18\" style=\"vertical-align: 0px;\"\/> est impair<\/td>\n<td style=\"border: 1px solid #0F2742;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-3f3584b2d8af5c334ab2872d86027ac9_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#55;&#94;&#50;&#32;&#61;&#32;&#52;&#57;\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"58\" style=\"vertical-align: 0px;\"\/><\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #0F2742;\"><strong>Fraction irr\u00e9ductible<\/strong><\/td>\n<td style=\"border: 1px solid #0F2742;\">num\u00e9rateur et d\u00e9nominateur n&rsquo;ont aucun diviseur commun positif autre que 1<\/td>\n<td style=\"border: 1px solid #0F2742;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-e08847452e55959c01c7e3b80a7793ec_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#100;&#102;&#114;&#97;&#99;&#123;&#56;&#52;&#125;&#123;&#49;&#50;&#54;&#125;&#32;&#61;&#32;&#92;&#100;&#102;&#114;&#97;&#99;&#123;&#50;&#125;&#123;&#51;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"36\" width=\"63\" style=\"vertical-align: -12px;\"\/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>&nbsp;<\/p>\n\t\t<div data-elementor-type=\"section\" data-elementor-id=\"186412\" class=\"elementor elementor-186412\">\n\t\t\t\t\t<div class=\"elementor-section-wrap\">\n\t\t\t\t\t\t\t\t<section class=\"has_ae_slider elementor-section elementor-inner-section elementor-element elementor-element-7b286009 elementor-section-content-bottom full_width elementor-section-full_width elementor-section-height-min-height elementor-section-height-default ae-bg-gallery-type-default\" data-id=\"7b286009\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-narrow\">\n\t\t\t\t\t<div class=\"has_ae_slider elementor-column elementor-col-66 elementor-inner-column elementor-element elementor-element-64f5fda0 ae-bg-gallery-type-default\" data-id=\"64f5fda0\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-bccc2bf elementor-widget elementor-widget-heading\" data-id=\"bccc2bf\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">COURS DE MATHS A DOMICILE<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6ba807dc elementor-widget elementor-widget-heading\" data-id=\"6ba807dc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Les meilleurs profs de maths pour <br \/> r\u00e9ussir sa scolarit\u00e9 <\/b><\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9f19bd5 elementor-widget elementor-widget-heading\" data-id=\"9f19bd5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">En ligne ou \u00e0 domicile<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2d959d5a elementor-align-left elementor-mobile-align-center elementor-widget elementor-widget-button\" data-id=\"2d959d5a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-md\" href=\"https:\/\/groupe-reussite.fr\/cours-particuliers\/maths\/tous-niveaux\/france\/\" target=\"_blank\" id=\"CTA_PRD_CP\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Je recherche un prof de maths \u00e0 domicile<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-21d714d4 elementor-widget elementor-widget-text-editor\" data-id=\"21d714d4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p style=\"text-align: left;\"><b>Avis Google France <\/b><span style=\"color: #e5a430;\"><b>\u2605\u2605\u2605\u2605\u2605<\/b><\/span><b> 4,9 sur 5<\/b><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"has_ae_slider elementor-column elementor-col-33 elementor-inner-column elementor-element elementor-element-2ffb5a60 ae-bg-gallery-type-default\" data-id=\"2ffb5a60\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\n<p>&nbsp;<\/p>\n<div class=\"style_pag\" style=\"color: #000; font-family: 'Lato', Sans-serif;\">\n<h2>Qu&rsquo;est-ce que l&rsquo;arithm\u00e9tique en seconde ?<\/h2>\n<p>L&rsquo;arithm\u00e9tique \u00e9tudie les nombres entiers : lesquels se divisent les uns par les autres, lesquels sont pairs, comment les d\u00e9composer. Le mot vient du grec <em>arithmos<\/em>, qui signifie \u00ab nombre \u00bb. En seconde, le chapitre reprend des notions vues au coll\u00e8ge et les \u00e9crit avec des lettres, ce qui permet de d\u00e9montrer des propri\u00e9t\u00e9s vraies pour tous les entiers, et pas seulement de les v\u00e9rifier sur quelques exemples.<\/p>\n<p>Le programme publi\u00e9 au Bulletin officiel n\u00b0 14 du 2 avril 2026 fixe ce qui est attendu :<\/p>\n<ul>\n<li><strong>Contenus :<\/strong> les notations <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-bc8e16cdad5408a0b540d2bc0098bcfb_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#109;&#97;&#116;&#104;&#98;&#98;&#123;&#78;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"13\" style=\"vertical-align: 0px;\"\/> et <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-e1ac530f2a83951115df3e0daa67b801_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#109;&#97;&#116;&#104;&#98;&#98;&#123;&#90;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"12\" style=\"vertical-align: 0px;\"\/>, les d\u00e9finitions de multiple, de diviseur, de nombre pair et de nombre impair.<\/li>\n<li><strong>Capacit\u00e9s :<\/strong> mod\u00e9liser et r\u00e9soudre des probl\u00e8mes avec ces notions, pr\u00e9senter les fractions sous forme irr\u00e9ductible.<\/li>\n<li><strong>D\u00e9monstrations :<\/strong> la somme de deux multiples de <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"\/> est un multiple de <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"\/> ; le carr\u00e9 d&rsquo;un nombre impair est impair.<\/li>\n<li><strong>Algorithmes :<\/strong> tester si un entier naturel <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"\/> est un multiple d&rsquo;un entier naturel <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-f56d50c26583f9a035ff6b4e3c0ca5c0_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#98;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"8\" style=\"vertical-align: 0px;\"\/> ; trouver le plus grand multiple de <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"\/> inf\u00e9rieur ou \u00e9gal \u00e0 <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-f56d50c26583f9a035ff6b4e3c0ca5c0_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#98;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"8\" style=\"vertical-align: 0px;\"\/>.<\/li>\n<\/ul>\n<p>Les nombres premiers, le PGCD et le PPCM ne figurent pas dans cette liste. Les nombres premiers ont \u00e9t\u00e9 \u00e9tudi\u00e9s au coll\u00e8ge et, avec le PGCD et le PPCM, ils restent des outils pratiques pour simplifier une fraction. C&rsquo;est \u00e0 ce titre qu&rsquo;ils sont pr\u00e9sent\u00e9s plus bas.<\/p>\n<h2>Que d\u00e9signent les ensembles \u2115 et \u2124 ?<\/h2>\n<ul>\n<li><img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-bc8e16cdad5408a0b540d2bc0098bcfb_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#109;&#97;&#116;&#104;&#98;&#98;&#123;&#78;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"13\" style=\"vertical-align: 0px;\"\/> est l&rsquo;ensemble des <strong>entiers naturels<\/strong> : 0, 1, 2, 3, 4\u2026 Ce sont les entiers positifs ou nuls.<\/li>\n<li><img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-e1ac530f2a83951115df3e0daa67b801_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#109;&#97;&#116;&#104;&#98;&#98;&#123;&#90;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"12\" style=\"vertical-align: 0px;\"\/> est l&rsquo;ensemble des <strong>entiers relatifs<\/strong> : \u2026, \u22123, \u22122, \u22121, 0, 1, 2, 3\u2026 Ce sont les entiers positifs et n\u00e9gatifs.<\/li>\n<\/ul>\n<p>Tout entier naturel est aussi un entier relatif, ce qui s&rsquo;\u00e9crit <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-162653682ed93958f5f4e2a5deac5a7b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#109;&#97;&#116;&#104;&#98;&#98;&#123;&#78;&#125;&#32;&#92;&#115;&#117;&#98;&#115;&#101;&#116;&#32;&#92;&#109;&#97;&#116;&#104;&#98;&#98;&#123;&#90;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"48\" style=\"vertical-align: -1px;\"\/>. Pour indiquer qu&rsquo;un nombre appartient \u00e0 un ensemble, on utilise le symbole <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-478c7dbb76fc8e5b0b52edad79847b31_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#105;&#110;\" title=\"Rendered by QuickLaTeX.com\" height=\"11\" width=\"10\" style=\"vertical-align: -1px;\"\/>, et <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-8d4036713cd7cddffcbec0b84ef07e86_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#110;&#111;&#116;&#105;&#110;\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"10\" style=\"vertical-align: -5px;\"\/> dans le cas contraire.<\/p>\n<p><em>Exemples :<\/em> <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-e22533f278c83d2959a4e04478fbe86b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#53;&#32;&#92;&#105;&#110;&#32;&#92;&#109;&#97;&#116;&#104;&#98;&#98;&#123;&#78;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"14\" width=\"44\" style=\"vertical-align: -1px;\"\/> ; <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-c9623f82384b01e4813e408af8cedcd0_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#45;&#53;&#32;&#92;&#105;&#110;&#32;&#92;&#109;&#97;&#116;&#104;&#98;&#98;&#123;&#90;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"14\" width=\"55\" style=\"vertical-align: -1px;\"\/> mais <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-6196db0e9db37b1cf80ad8e593857ebe_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#45;&#53;&#32;&#92;&#110;&#111;&#116;&#105;&#110;&#32;&#92;&#109;&#97;&#116;&#104;&#98;&#98;&#123;&#78;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"56\" style=\"vertical-align: -5px;\"\/> ; <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-9693a432aa583db42232eb1651202ef4_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#50;&#123;&#44;&#125;&#53;&#32;&#92;&#110;&#111;&#116;&#105;&#110;&#32;&#92;&#109;&#97;&#116;&#104;&#98;&#98;&#123;&#90;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"56\" style=\"vertical-align: -5px;\"\/>.<\/p>\n<h2>Comment savoir si un nombre est un multiple ou un diviseur d&rsquo;un autre ?<\/h2>\n<p><strong>D\u00e9finition :<\/strong> soit <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"\/> et <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-f56d50c26583f9a035ff6b4e3c0ca5c0_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#98;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"8\" style=\"vertical-align: 0px;\"\/> deux entiers. On dit que <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"\/> est un <strong>multiple<\/strong> de <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-f56d50c26583f9a035ff6b4e3c0ca5c0_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#98;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"8\" style=\"vertical-align: 0px;\"\/> s&rsquo;il existe un entier <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-3422b6bb5c160593658b7c39425d9880_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#107;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"9\" style=\"vertical-align: 0px;\"\/> tel que :<\/p>\n<p dir=\"ltr\" style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-33d94e537d0f7ee2ecf5161bc320877d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;&#32;&#61;&#32;&#107;&#98;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"51\" style=\"vertical-align: 0px;\"\/><\/p>\n<p>Lorsque <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-ec62276a9bce8f24170cfe968628306d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#98;&#32;&#92;&#110;&#101;&#113;&#32;&#48;\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"40\" style=\"vertical-align: -4px;\"\/>, on dit aussi que <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-f56d50c26583f9a035ff6b4e3c0ca5c0_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#98;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"8\" style=\"vertical-align: 0px;\"\/> est un <strong>diviseur<\/strong> de <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"\/>, ou que <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"\/> est <strong>divisible<\/strong> par <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-f56d50c26583f9a035ff6b4e3c0ca5c0_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#98;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"8\" style=\"vertical-align: 0px;\"\/>.<\/p>\n<p><em>Exemple :<\/em> <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-1792cbffb7acd95ce24d79027a5cf37f_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#52;&#50;&#32;&#61;&#32;&#54;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#55;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"81\" style=\"vertical-align: 0px;\"\/>. Donc 42 est un multiple de 7, 7 est un diviseur de 42, et 42 est divisible par 7 (et par 6).<\/p>\n<p>Trois remarques \u00e0 conna\u00eetre :<\/p>\n<ul>\n<li>0 est un multiple de tous les entiers, car <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-016a987bf296d1053694b17c2259d04e_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#48;&#32;&#61;&#32;&#48;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#98;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"71\" style=\"vertical-align: 0px;\"\/>.<\/li>\n<li>1 et \u22121 sont des diviseurs de tous les entiers.<\/li>\n<li>Un entier non nul a un nombre fini de diviseurs, mais une infinit\u00e9 de multiples.<\/li>\n<\/ul>\n<h3>Comment tester si a est un multiple de b ?<\/h3>\n<p>Calculez <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-65401688a6d29528762d26ad54fa20d0_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;&#32;&#92;&#100;&#105;&#118;&#32;&#98;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"39\" style=\"vertical-align: -1px;\"\/> (avec <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-ec62276a9bce8f24170cfe968628306d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#98;&#32;&#92;&#110;&#101;&#113;&#32;&#48;\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"40\" style=\"vertical-align: -4px;\"\/>). Si le r\u00e9sultat est un entier, <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"\/> est un multiple de <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-f56d50c26583f9a035ff6b4e3c0ca5c0_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#98;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"8\" style=\"vertical-align: 0px;\"\/>. Sinon, il ne l&rsquo;est pas.<\/p>\n<p><em>Exemples :<\/em> <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5081cd18451133a51585c8774c0db9c8_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#57;&#49;&#32;&#92;&#100;&#105;&#118;&#32;&#55;&#32;&#61;&#32;&#49;&#51;\" title=\"Rendered by QuickLaTeX.com\" height=\"14\" width=\"90\" style=\"vertical-align: -1px;\"\/>, donc 91 est un multiple de 7. En revanche, <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-56d3597ed5770305009138a59d5e5d9a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#51;&#53;&#32;&#92;&#100;&#105;&#118;&#32;&#52;&#32;&#61;&#32;&#56;&#123;&#44;&#125;&#55;&#53;\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"103\" style=\"vertical-align: -4px;\"\/>, donc 35 n&rsquo;est pas un multiple de 4.<\/p>\n<p>En Python, ce test s&rsquo;\u00e9crit avec l&rsquo;op\u00e9rateur <code>%<\/code>, qui donne le reste de la division euclidienne. Le reste est nul exactement quand <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"\/> est un multiple de <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-f56d50c26583f9a035ff6b4e3c0ca5c0_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#98;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"8\" style=\"vertical-align: 0px;\"\/> :<\/p>\n<pre><code>def est_multiple(a, b):\r\n    return a % b == 0<\/code><\/pre>\n<p>L&rsquo;appel <code>est_multiple(91, 7)<\/code> renvoie <code>True<\/code>.<\/p>\n<p>Pour trouver le <strong>plus grand multiple de <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"\/> inf\u00e9rieur ou \u00e9gal \u00e0 <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-f56d50c26583f9a035ff6b4e3c0ca5c0_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#98;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"8\" style=\"vertical-align: 0px;\"\/><\/strong>, effectuez la division euclidienne de <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-f56d50c26583f9a035ff6b4e3c0ca5c0_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#98;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"8\" style=\"vertical-align: 0px;\"\/> par <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"\/> : <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-aa9c679d2dda070331cc91b3b1d4ec23_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#98;&#32;&#61;&#32;&#97;&#113;&#32;&#43;&#32;&#114;\" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"79\" style=\"vertical-align: -4px;\"\/> avec <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-878f4b8d5e73026ea128effd65a75fa5_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#48;&#32;&#92;&#108;&#101;&#113;&#115;&#108;&#97;&#110;&#116;&#32;&#114;&#32;&#60;&#32;&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"74\" style=\"vertical-align: -3px;\"\/>. Le multiple cherch\u00e9 est <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-37fcd75375086d2c2f29f671ed06140b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;&#113;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"17\" style=\"vertical-align: -4px;\"\/>.<\/p>\n<p><em>Exemple :<\/em> le plus grand multiple de 7 inf\u00e9rieur ou \u00e9gal \u00e0 100. On a <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-baf36c8b5b8841618a74d89ceca0e62f_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#49;&#48;&#48;&#32;&#61;&#32;&#55;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#49;&#52;&#32;&#43;&#32;&#50;\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"127\" style=\"vertical-align: -2px;\"\/>, donc c&rsquo;est <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-2cd7f86b3751578548f9ea41c18b466e_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#55;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#49;&#52;&#32;&#61;&#32;&#57;&#56;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"90\" style=\"vertical-align: 0px;\"\/>. En Python : <code>(b \/\/ a) * a<\/code>, o\u00f9 <code>\/\/<\/code> donne le quotient entier.<\/p>\n<h3>Comment trouver tous les diviseurs d&rsquo;un entier ?<\/h3>\n<p>Cherchez tous les produits de deux entiers positifs \u00e9gaux au nombre, en testant 1, 2, 3\u2026 jusqu&rsquo;\u00e0 ce que les deux facteurs se rejoignent.<\/p>\n<p><em>Exemple avec 36 :<\/em> <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-555ee83fee01b257b96ab32cfd986495_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#49;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#51;&#54;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"48\" style=\"vertical-align: 0px;\"\/>, <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-789480a8aa5c9967a2db529e4408d6fb_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#50;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#49;&#56;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"49\" style=\"vertical-align: 0px;\"\/>, <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-9485ae6187f7f169ed8e35ea92e2cf12_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#51;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#49;&#50;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"48\" style=\"vertical-align: 0px;\"\/>, <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-d067cc6923ac4914f0cb7d6d1cc6eeac_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#52;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#57;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"40\" style=\"vertical-align: 0px;\"\/>, <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-c3c3fb3ee205d2e7d902e93dc87448cd_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#54;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#54;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"40\" style=\"vertical-align: 0px;\"\/>. Les diviseurs positifs de 36 sont donc 1, 2, 3, 4, 6, 9, 12, 18 et 36. Si l&rsquo;\u00e9nonc\u00e9 travaille dans <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-e1ac530f2a83951115df3e0daa67b801_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#109;&#97;&#116;&#104;&#98;&#98;&#123;&#90;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"12\" style=\"vertical-align: 0px;\"\/>, ajoutez leurs oppos\u00e9s : \u22121, \u22122, \u22123, \u22124, \u22126, \u22129, \u221212, \u221218 et \u221236.<\/p>\n<h3>Quels crit\u00e8res de divisibilit\u00e9 utiliser ?<\/h3>\n<p>Les crit\u00e8res de divisibilit\u00e9, vus au coll\u00e8ge, permettent de savoir si un entier est divisible par un autre sans poser la division. Ils ne sont pas cit\u00e9s dans le programme de seconde, mais ils font gagner du temps pour simplifier une fraction.<\/p>\n<table class=\"table\" style=\"width: 100%; border-color: #0F2742; color: #0f2742; background: #ffffff;\">\n<tbody>\n<tr>\n<td style=\"background: #0F2742; color: #ffffff; border: 1px solid #0F2742; text-align: left;\"><strong>Divisible par<\/strong><\/td>\n<td style=\"background: #0F2742; color: #ffffff; border: 1px solid #0F2742; text-align: left;\"><strong>Crit\u00e8re<\/strong><\/td>\n<td style=\"background: #0F2742; color: #ffffff; border: 1px solid #0F2742; text-align: left;\"><strong>Exemple<\/strong><\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #0F2742;\"><strong>2<\/strong><\/td>\n<td style=\"border: 1px solid #0F2742;\">le chiffre des unit\u00e9s est 0, 2, 4, 6 ou 8<\/td>\n<td style=\"border: 1px solid #0F2742;\">1 358<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #0F2742;\"><strong>3<\/strong><\/td>\n<td style=\"border: 1px solid #0F2742;\">la somme des chiffres est divisible par 3<\/td>\n<td style=\"border: 1px solid #0F2742;\">123 : <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-590ea5134de9c0022cf8c7bda375401c_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#49;&#32;&#43;&#32;&#50;&#32;&#43;&#32;&#51;&#32;&#61;&#32;&#54;\" title=\"Rendered by QuickLaTeX.com\" height=\"14\" width=\"102\" style=\"vertical-align: -2px;\"\/><\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #0F2742;\"><strong>4<\/strong><\/td>\n<td style=\"border: 1px solid #0F2742;\">le nombre form\u00e9 par les deux derniers chiffres est divisible par 4<\/td>\n<td style=\"border: 1px solid #0F2742;\">2 132 : <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-fd34b87073d14e35be7cae76a0c564b4_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#51;&#50;&#32;&#61;&#32;&#52;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#56;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"81\" style=\"vertical-align: 0px;\"\/><\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #0F2742;\"><strong>5<\/strong><\/td>\n<td style=\"border: 1px solid #0F2742;\">le chiffre des unit\u00e9s est 0 ou 5<\/td>\n<td style=\"border: 1px solid #0F2742;\">745<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #0F2742;\"><strong>9<\/strong><\/td>\n<td style=\"border: 1px solid #0F2742;\">la somme des chiffres est divisible par 9<\/td>\n<td style=\"border: 1px solid #0F2742;\">4 572 : <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-db44e33b115a33b9213ee30e1f1cf64c_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#52;&#32;&#43;&#32;&#53;&#32;&#43;&#32;&#55;&#32;&#43;&#32;&#50;&#32;&#61;&#32;&#49;&#56;\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"142\" style=\"vertical-align: -2px;\"\/><\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #0F2742;\"><strong>10<\/strong><\/td>\n<td style=\"border: 1px solid #0F2742;\">le chiffre des unit\u00e9s est 0<\/td>\n<td style=\"border: 1px solid #0F2742;\">13 450<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<div style=\"background: #FFF8EC; border-left: 6px solid #C77F0C; padding: 15px; margin: 20px 0; color: #0f2742;\"><strong>&#x1f4a1; Astuce :<\/strong> un nombre divisible par 2 et par 3 est divisible par 6. Mais cette r\u00e8gle ne marche pas avec n&rsquo;importe quels diviseurs : 12 est divisible par 4 et par 6, et pourtant 12 n&rsquo;est pas divisible par 24. Elle fonctionne seulement quand les deux diviseurs n&rsquo;ont aucun diviseur commun autre que 1, comme 2 et 3, ou 3 et 5.<\/div>\n<h2>Pourquoi la somme de deux multiples de a est-elle un multiple de a ?<\/h2>\n<p><strong>Propri\u00e9t\u00e9 :<\/strong> soit <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"\/> un entier. Si <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-6b41df788161942c6f98604d37de8098_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#109;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"15\" style=\"vertical-align: 0px;\"\/> et <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-b170995d512c659d8668b4e42e1fef6b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#110;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"11\" style=\"vertical-align: 0px;\"\/> sont deux multiples de <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"\/>, alors <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-f7f5ff24db011fb695802c7a5e40bde4_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#109;&#32;&#43;&#32;&#110;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"48\" style=\"vertical-align: -2px;\"\/> est un multiple de <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"\/>.<\/p>\n<p><strong>D\u00e9monstration :<\/strong><\/p>\n<ul>\n<li><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-6b41df788161942c6f98604d37de8098_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#109;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"15\" style=\"vertical-align: 0px;\"\/> est un multiple de <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"\/> : il existe un entier <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-3422b6bb5c160593658b7c39425d9880_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#107;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"9\" style=\"vertical-align: 0px;\"\/> tel que <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-9a464280fd89ead9770cbdfbc9177945_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#109;&#32;&#61;&#32;&#107;&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"58\" style=\"vertical-align: 0px;\"\/>.<\/li>\n<li><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-b170995d512c659d8668b4e42e1fef6b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#110;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"11\" style=\"vertical-align: 0px;\"\/> est un multiple de <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"\/> : il existe un entier <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-20978fc71e693c6b0ca59b41daaed2b9_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#107;&#39;\" title=\"Rendered by QuickLaTeX.com\" height=\"14\" width=\"14\" style=\"vertical-align: 0px;\"\/> tel que <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-ae4ec01ffeff5bdb0e71a6829f9f3d35_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#110;&#32;&#61;&#32;&#107;&#39;&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"14\" width=\"58\" style=\"vertical-align: 0px;\"\/>.<\/li>\n<li>Alors <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-31f595ab1c95f948c69f2a1a3591276d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#109;&#32;&#43;&#32;&#110;&#32;&#61;&#32;&#107;&#97;&#32;&#43;&#32;&#107;&#39;&#97;&#32;&#61;&#32;&#40;&#107;&#32;&#43;&#32;&#107;&#39;&#41;&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"228\" style=\"vertical-align: -5px;\"\/>.<\/li>\n<li><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-ed98326fe01eb839b1dd75548524bf48_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#107;&#32;&#43;&#32;&#107;&#39;\" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"45\" style=\"vertical-align: -2px;\"\/> est une somme de deux entiers, donc c&rsquo;est un entier. <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-f7f5ff24db011fb695802c7a5e40bde4_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#109;&#32;&#43;&#32;&#110;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"48\" style=\"vertical-align: -2px;\"\/> s&rsquo;\u00e9crit sous la forme (entier) <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-b91ec73c0684c621e57c42e11456d19c_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"9\" width=\"21\" style=\"vertical-align: 0px;\"\/> : c&rsquo;est un multiple de <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"\/>.<\/li>\n<\/ul>\n<p><em>Exemple :<\/em> <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-543ce8adae56831079c4ac8a776e5361_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#50;&#49;&#32;&#61;&#32;&#55;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#51;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"81\" style=\"vertical-align: 0px;\"\/> et <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-a38850288ac53f4b8185b30ebaeafc23_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#51;&#53;&#32;&#61;&#32;&#55;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#53;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"80\" style=\"vertical-align: 0px;\"\/>. Leur somme vaut <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-82dfdafb7545caddab3e9445a6be4da9_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#53;&#54;&#32;&#61;&#32;&#55;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#56;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"81\" style=\"vertical-align: 0px;\"\/>, qui est bien un multiple de 7.<\/p>\n<p>La m\u00eame m\u00e9thode montre que la diff\u00e9rence <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-32798ba17f2f1d5f7ecb656d87d6a48b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#109;&#32;&#45;&#32;&#110;&#32;&#61;&#32;&#40;&#107;&#32;&#45;&#32;&#107;&#39;&#41;&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"140\" style=\"vertical-align: -5px;\"\/> est aussi un multiple de <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"\/>.<\/p>\n<p><em>Application :<\/em> la somme de trois entiers cons\u00e9cutifs est un multiple de 3. En effet, <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-07e2594781144e9d83edfec7bc881db9_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#110;&#32;&#43;&#32;&#40;&#110;&#32;&#43;&#32;&#49;&#41;&#32;&#43;&#32;&#40;&#110;&#32;&#43;&#32;&#50;&#41;&#32;&#61;&#32;&#51;&#110;&#32;&#43;&#32;&#51;&#32;&#61;&#32;&#51;&#40;&#110;&#32;&#43;&#32;&#49;&#41;\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"324\" style=\"vertical-align: -5px;\"\/>, et <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-d765457d0ddab8a9a397a2ca4bd1f567_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#110;&#32;&#43;&#32;&#49;\" title=\"Rendered by QuickLaTeX.com\" height=\"14\" width=\"40\" style=\"vertical-align: -2px;\"\/> est un entier.<\/p>\n<div style=\"background: #FFF8EC; border-left: 6px solid #C77F0C; padding: 15px; margin: 20px 0; color: #0f2742;\"><strong>&#x1f4a1; Astuce :<\/strong> dans une d\u00e9monstration, n&rsquo;utilisez jamais la m\u00eame lettre <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-3422b6bb5c160593658b7c39425d9880_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#107;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"9\" style=\"vertical-align: 0px;\"\/> pour deux multiples diff\u00e9rents. \u00c9crire <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-9a464280fd89ead9770cbdfbc9177945_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#109;&#32;&#61;&#32;&#107;&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"58\" style=\"vertical-align: 0px;\"\/> et <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-8b292c1aa4aa160b1c374b73bf8cad2c_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#110;&#32;&#61;&#32;&#107;&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"53\" style=\"vertical-align: 0px;\"\/> reviendrait \u00e0 supposer que <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-b5efc08572bb5cc22f1747fed96c12fc_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#109;&#32;&#61;&#32;&#110;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"50\" style=\"vertical-align: 0px;\"\/>.<\/div>\n<h2>Comment reconna\u00eetre un nombre pair ou impair ?<\/h2>\n<p><strong>D\u00e9finition :<\/strong> un entier <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-b170995d512c659d8668b4e42e1fef6b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#110;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"11\" style=\"vertical-align: 0px;\"\/> est <strong>pair<\/strong> s&rsquo;il est un multiple de 2, c&rsquo;est-\u00e0-dire s&rsquo;il existe un entier <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-3422b6bb5c160593658b7c39425d9880_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#107;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"9\" style=\"vertical-align: 0px;\"\/> tel que <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-6e6a566793afcb732482cd68f2d360d7_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#110;&#32;&#61;&#32;&#50;&#107;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"52\" style=\"vertical-align: 0px;\"\/>. Il est <strong>impair<\/strong> sinon, et il existe alors un entier <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-3422b6bb5c160593658b7c39425d9880_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#107;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"9\" style=\"vertical-align: 0px;\"\/> tel que <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-1d2a57c44e9471b9c667edd32a771c27_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#110;&#32;&#61;&#32;&#50;&#107;&#32;&#43;&#32;&#49;\" title=\"Rendered by QuickLaTeX.com\" height=\"14\" width=\"83\" style=\"vertical-align: -2px;\"\/>.<\/p>\n<p><em>Exemples :<\/em> <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-8e3fae5b9c7bd52b3c8e9715d9ac2ae1_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#49;&#56;&#32;&#61;&#32;&#50;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#57;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"80\" style=\"vertical-align: 0px;\"\/> et <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-cc1ebab55ec96ea03fcc10d67c84cf29_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#48;&#32;&#61;&#32;&#50;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#48;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"72\" style=\"vertical-align: 0px;\"\/> sont pairs ; <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-381958fe671aaafdd9242f0545f4919a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#45;&#54;&#32;&#61;&#32;&#50;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#40;&#45;&#51;&#41;\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"112\" style=\"vertical-align: -5px;\"\/> est pair ; <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-36597e02dbf44dc23626649af3583d52_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#55;&#32;&#61;&#32;&#50;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#51;&#32;&#43;&#32;&#49;\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"102\" style=\"vertical-align: -2px;\"\/> et <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-b17997770e5b72fa0167b8633e80c242_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#45;&#55;&#32;&#61;&#32;&#50;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#40;&#45;&#52;&#41;&#32;&#43;&#32;&#49;\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"142\" style=\"vertical-align: -5px;\"\/> sont impairs.<\/p>\n<p>Ces r\u00e8gles se d\u00e9montrent toutes en \u00e9crivant les nombres sous la forme <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-ff2415280f3cdf88317c3d5ccf7c44d7_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#50;&#107;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"18\" style=\"vertical-align: 0px;\"\/> ou <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-181e577cd08275de817eeac9579a90d0_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#50;&#107;&#32;&#43;&#32;&#49;\" title=\"Rendered by QuickLaTeX.com\" height=\"14\" width=\"48\" style=\"vertical-align: -2px;\"\/> :<\/p>\n<table class=\"table\" style=\"width: 100%; border-color: #0F2742; color: #0f2742; background: #ffffff;\">\n<tbody>\n<tr>\n<td style=\"background: #0F2742; color: #ffffff; border: 1px solid #0F2742; text-align: left;\"><strong>Op\u00e9ration<\/strong><\/td>\n<td style=\"background: #0F2742; color: #ffffff; border: 1px solid #0F2742; text-align: left;\"><strong>R\u00e9sultat<\/strong><\/td>\n<td style=\"background: #0F2742; color: #ffffff; border: 1px solid #0F2742; text-align: left;\"><strong>Justification<\/strong><\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #0F2742;\"><strong>pair + pair<\/strong><\/td>\n<td style=\"border: 1px solid #0F2742;\">pair<\/td>\n<td style=\"border: 1px solid #0F2742;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-eafa8b1d00d4eb86854e8cedcd63f08a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#50;&#107;&#32;&#43;&#32;&#50;&#107;&#39;&#32;&#61;&#32;&#50;&#40;&#107;&#32;&#43;&#32;&#107;&#39;&#41;\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"155\" style=\"vertical-align: -5px;\"\/><\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #0F2742;\"><strong>impair + impair<\/strong><\/td>\n<td style=\"border: 1px solid #0F2742;\">pair<\/td>\n<td style=\"border: 1px solid #0F2742;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-9d1769b048076bd4e1f1a83b1ab606f4_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#40;&#50;&#107;&#32;&#43;&#32;&#49;&#41;&#32;&#43;&#32;&#40;&#50;&#107;&#39;&#32;&#43;&#32;&#49;&#41;&#32;&#61;&#32;&#50;&#40;&#107;&#32;&#43;&#32;&#107;&#39;&#32;&#43;&#32;&#49;&#41;\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"273\" style=\"vertical-align: -5px;\"\/><\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #0F2742;\"><strong>pair + impair<\/strong><\/td>\n<td style=\"border: 1px solid #0F2742;\">impair<\/td>\n<td style=\"border: 1px solid #0F2742;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-e9e29c399d43f024bff9e948ed49d5f4_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#50;&#107;&#32;&#43;&#32;&#40;&#50;&#107;&#39;&#32;&#43;&#32;&#49;&#41;&#32;&#61;&#32;&#50;&#40;&#107;&#32;&#43;&#32;&#107;&#39;&#41;&#32;&#43;&#32;&#49;\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"230\" style=\"vertical-align: -5px;\"\/><\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #0F2742;\"><strong>pair \u00d7 entier<\/strong><\/td>\n<td style=\"border: 1px solid #0F2742;\">pair<\/td>\n<td style=\"border: 1px solid #0F2742;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-77d7c113e67b2b45e77f219d52b11f90_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#50;&#107;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#109;&#32;&#61;&#32;&#50;&#40;&#107;&#109;&#41;\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"127\" style=\"vertical-align: -5px;\"\/><\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #0F2742;\"><strong>impair \u00d7 impair<\/strong><\/td>\n<td style=\"border: 1px solid #0F2742;\">impair<\/td>\n<td style=\"border: 1px solid #0F2742;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-3989fd5f0db6c02f281ce778082aa039_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#40;&#50;&#107;&#32;&#43;&#32;&#49;&#41;&#40;&#50;&#107;&#39;&#32;&#43;&#32;&#49;&#41;&#32;&#61;&#32;&#50;&#40;&#50;&#107;&#107;&#39;&#32;&#43;&#32;&#107;&#32;&#43;&#32;&#107;&#39;&#41;&#32;&#43;&#32;&#49;\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"306\" style=\"vertical-align: -5px;\"\/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p>Cons\u00e9quence utile : parmi deux entiers cons\u00e9cutifs <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-b170995d512c659d8668b4e42e1fef6b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#110;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"11\" style=\"vertical-align: 0px;\"\/> et <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-d765457d0ddab8a9a397a2ca4bd1f567_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#110;&#32;&#43;&#32;&#49;\" title=\"Rendered by QuickLaTeX.com\" height=\"14\" width=\"40\" style=\"vertical-align: -2px;\"\/>, l&rsquo;un est pair, donc leur produit <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-84920075232c311c6d6095ce50c1740a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#110;&#40;&#110;&#32;&#43;&#32;&#49;&#41;\" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"65\" style=\"vertical-align: -4px;\"\/> est toujours pair.<\/p>\n<h2>Comment d\u00e9montrer que le carr\u00e9 d&rsquo;un nombre impair est impair ?<\/h2>\n<p><strong>Propri\u00e9t\u00e9 :<\/strong> si <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-b170995d512c659d8668b4e42e1fef6b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#110;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"11\" style=\"vertical-align: 0px;\"\/> est un entier impair, alors <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-a715fc0f84b8bee4928e92097d5eabfc_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#110;&#94;&#50;\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"18\" style=\"vertical-align: 0px;\"\/> est impair.<\/p>\n<p><strong>D\u00e9monstration :<\/strong> <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-b170995d512c659d8668b4e42e1fef6b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#110;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"11\" style=\"vertical-align: 0px;\"\/> est impair, donc il existe un entier <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-3422b6bb5c160593658b7c39425d9880_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#107;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"9\" style=\"vertical-align: 0px;\"\/> tel que <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-1d2a57c44e9471b9c667edd32a771c27_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#110;&#32;&#61;&#32;&#50;&#107;&#32;&#43;&#32;&#49;\" title=\"Rendered by QuickLaTeX.com\" height=\"14\" width=\"83\" style=\"vertical-align: -2px;\"\/>. En d\u00e9veloppant avec l&rsquo;identit\u00e9 <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-feb1e2083cb52fe1f5e0c052ef79592f_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#40;&#97;&#32;&#43;&#32;&#98;&#41;&#94;&#50;&#32;&#61;&#32;&#97;&#94;&#50;&#32;&#43;&#32;&#50;&#97;&#98;&#32;&#43;&#32;&#98;&#94;&#50;\" title=\"Rendered by QuickLaTeX.com\" height=\"20\" width=\"184\" style=\"vertical-align: -5px;\"\/> :<\/p>\n<p dir=\"ltr\" style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-47bfbcb2052998f13da80a14d86236b4_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#110;&#94;&#50;&#32;&#61;&#32;&#40;&#50;&#107;&#32;&#43;&#32;&#49;&#41;&#94;&#50;&#32;&#61;&#32;&#52;&#107;&#94;&#50;&#32;&#43;&#32;&#52;&#107;&#32;&#43;&#32;&#49;&#32;&#61;&#32;&#50;&#40;&#50;&#107;&#94;&#50;&#32;&#43;&#32;&#50;&#107;&#41;&#32;&#43;&#32;&#49;\" title=\"Rendered by QuickLaTeX.com\" height=\"20\" width=\"376\" style=\"vertical-align: -5px;\"\/><\/p>\n<p>Posons <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-8e5c53cd4817989cbb5daa150c17a33e_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#75;&#32;&#61;&#32;&#50;&#107;&#94;&#50;&#32;&#43;&#32;&#50;&#107;\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"106\" style=\"vertical-align: -2px;\"\/>. <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-ea9c87a513e4a72624155d392fae86e2_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#75;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"16\" style=\"vertical-align: 0px;\"\/> est un entier, car il s&rsquo;obtient par produits et sommes d&rsquo;entiers. Donc <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-a5067c0ce66b631deb271e88e9f008bb_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#110;&#94;&#50;&#32;&#61;&#32;&#50;&#75;&#32;&#43;&#32;&#49;\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"97\" style=\"vertical-align: -2px;\"\/> : <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-a715fc0f84b8bee4928e92097d5eabfc_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#110;&#94;&#50;\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"18\" style=\"vertical-align: 0px;\"\/> est impair.<\/p>\n<p><em>Exemple :<\/em> avec <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-85c520d4d93c7b2260f11feb4713042b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#107;&#32;&#61;&#32;&#51;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"42\" style=\"vertical-align: 0px;\"\/>, <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-b79a19e31158262c69ce4a9f9d2aa627_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#110;&#32;&#61;&#32;&#55;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"43\" style=\"vertical-align: 0px;\"\/> et <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-123d8ac5a4c2d9e61f6d3a45cc39e40d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#110;&#94;&#50;&#32;&#61;&#32;&#52;&#57;&#32;&#61;&#32;&#50;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#50;&#52;&#32;&#43;&#32;&#49;\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"161\" style=\"vertical-align: -2px;\"\/>. On retrouve bien <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-37784430506f5e588e7d5fe3be8b7ac1_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#75;&#32;&#61;&#32;&#50;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#57;&#32;&#43;&#32;&#50;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#51;&#32;&#61;&#32;&#50;&#52;\" title=\"Rendered by QuickLaTeX.com\" height=\"14\" width=\"182\" style=\"vertical-align: -2px;\"\/>.<\/p>\n<p>La contrapos\u00e9e de cette propri\u00e9t\u00e9 s&rsquo;\u00e9nonce ainsi : si <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-a715fc0f84b8bee4928e92097d5eabfc_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#110;&#94;&#50;\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"18\" style=\"vertical-align: 0px;\"\/> est pair, alors <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-b170995d512c659d8668b4e42e1fef6b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#110;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"11\" style=\"vertical-align: 0px;\"\/> est pair. C&rsquo;est elle qui sert dans la d\u00e9monstration de l&rsquo;irrationalit\u00e9 de <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-0f51c9c2ccb4ec4dcca8926b645d14c4_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#115;&#113;&#114;&#116;&#123;&#50;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"23\" style=\"vertical-align: -2px;\"\/>, \u00e9galement au programme de seconde.<\/p>\n<h2>Comment \u00e9crire une fraction sous forme irr\u00e9ductible ?<\/h2>\n<p>Une fraction <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-0bfd55df50a9a215ae8bf09c792fca21_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#100;&#102;&#114;&#97;&#99;&#123;&#97;&#125;&#123;&#98;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"32\" width=\"10\" style=\"vertical-align: -12px;\"\/> (avec <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-ec62276a9bce8f24170cfe968628306d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#98;&#32;&#92;&#110;&#101;&#113;&#32;&#48;\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"40\" style=\"vertical-align: -4px;\"\/>) est <strong>irr\u00e9ductible<\/strong> quand <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"\/> et <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-f56d50c26583f9a035ff6b4e3c0ca5c0_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#98;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"8\" style=\"vertical-align: 0px;\"\/> n&rsquo;ont aucun diviseur commun positif autre que 1. Pour simplifier une fraction, on divise le num\u00e9rateur et le d\u00e9nominateur par un m\u00eame entier non nul : sa valeur ne change pas.<\/p>\n<h3>M\u00e9thode 1 : simplifier par \u00e9tapes avec les crit\u00e8res de divisibilit\u00e9<\/h3>\n<p><em>Exemple avec<\/em> <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-fd988f3f979cd614eb901cfeef7755ab_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#100;&#102;&#114;&#97;&#99;&#123;&#56;&#52;&#125;&#123;&#49;&#50;&#54;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"36\" width=\"27\" style=\"vertical-align: -12px;\"\/> :<\/p>\n<ul>\n<li>84 et 126 sont pairs : <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-75b1a9a860c4c4b9635b72954e472a43_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#100;&#102;&#114;&#97;&#99;&#123;&#56;&#52;&#125;&#123;&#49;&#50;&#54;&#125;&#32;&#61;&#32;&#92;&#100;&#102;&#114;&#97;&#99;&#123;&#52;&#50;&#125;&#123;&#54;&#51;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"36\" width=\"72\" style=\"vertical-align: -12px;\"\/>.<\/li>\n<li><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-6f4a8b9f99a035793e9a2ef9401c94db_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#52;&#32;&#43;&#32;&#50;&#32;&#61;&#32;&#54;\" title=\"Rendered by QuickLaTeX.com\" height=\"14\" width=\"72\" style=\"vertical-align: -2px;\"\/> et <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-36a97cb072c770ddb95ce6a16f4d9917_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#54;&#32;&#43;&#32;&#51;&#32;&#61;&#32;&#57;\" title=\"Rendered by QuickLaTeX.com\" height=\"14\" width=\"72\" style=\"vertical-align: -2px;\"\/> : 42 et 63 sont divisibles par 3, donc <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-2822df2ffa223e9b69a7fae1c8e28581_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#100;&#102;&#114;&#97;&#99;&#123;&#52;&#50;&#125;&#123;&#54;&#51;&#125;&#32;&#61;&#32;&#92;&#100;&#102;&#114;&#97;&#99;&#123;&#49;&#52;&#125;&#123;&#50;&#49;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"36\" width=\"63\" style=\"vertical-align: -12px;\"\/>.<\/li>\n<li>14 et 21 sont des multiples de 7 : <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-daa7163fca86366f63376f8e60b24aa4_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#100;&#102;&#114;&#97;&#99;&#123;&#49;&#52;&#125;&#123;&#50;&#49;&#125;&#32;&#61;&#32;&#92;&#100;&#102;&#114;&#97;&#99;&#123;&#50;&#125;&#123;&#51;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"36\" width=\"54\" style=\"vertical-align: -12px;\"\/>.<\/li>\n<\/ul>\n<p>2 et 3 n&rsquo;ont pas de diviseur commun autre que 1 : <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-2f555bfd0c034276aafa1f59270cc183_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#100;&#102;&#114;&#97;&#99;&#123;&#50;&#125;&#123;&#51;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"36\" width=\"9\" style=\"vertical-align: -12px;\"\/> est irr\u00e9ductible. Attention, <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-3f71453aa5b1e57820188a2660ef7c4d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#100;&#102;&#114;&#97;&#99;&#123;&#52;&#50;&#125;&#123;&#54;&#51;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"36\" width=\"18\" style=\"vertical-align: -12px;\"\/> est une fraction simplifi\u00e9e, mais elle n&rsquo;est pas irr\u00e9ductible.<\/p>\n<h3>M\u00e9thode 2 : d\u00e9composer en produit de facteurs premiers<\/h3>\n<p>Un <strong>nombre premier<\/strong> est un entier naturel qui a exactement deux diviseurs positifs distincts : 1 et lui-m\u00eame. Le nombre 1 n&rsquo;est donc pas premier. Les nombres premiers inf\u00e9rieurs \u00e0 30 sont 2, 3, 5, 7, 11, 13, 17, 19, 23 et 29.<\/p>\n<p>Tout entier sup\u00e9rieur ou \u00e9gal \u00e0 2 s&rsquo;\u00e9crit de fa\u00e7on unique, \u00e0 l&rsquo;ordre des facteurs pr\u00e8s, comme un produit de nombres premiers. Pour trouver cette d\u00e9composition, divisez par 2 tant que c&rsquo;est possible, puis par 3, puis par 5, par 7, et ainsi de suite.<\/p>\n<p dir=\"ltr\" style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-74b582d226d816a99c200d83809359e4_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#56;&#52;&#32;&#61;&#32;&#50;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#52;&#50;&#32;&#61;&#32;&#50;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#50;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#50;&#49;&#32;&#61;&#32;&#50;&#94;&#50;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#51;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#55;\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"293\" style=\"vertical-align: 0px;\"\/><\/p>\n<p dir=\"ltr\" style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-65a27cbfb9cc5e4043e5b3946bb2d5ec_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#49;&#50;&#54;&#32;&#61;&#32;&#50;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#54;&#51;&#32;&#61;&#32;&#50;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#51;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#50;&#49;&#32;&#61;&#32;&#50;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#51;&#94;&#50;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#55;\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"301\" style=\"vertical-align: 0px;\"\/><\/p>\n<p>On simplifie ensuite par les facteurs communs, ici 2, 3 et 7 :<\/p>\n<p dir=\"ltr\" style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-32ebe4b27d66028cc32fc633029fc2b3_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#100;&#102;&#114;&#97;&#99;&#123;&#56;&#52;&#125;&#123;&#49;&#50;&#54;&#125;&#32;&#61;&#32;&#92;&#100;&#102;&#114;&#97;&#99;&#123;&#50;&#94;&#50;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#51;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#55;&#125;&#123;&#50;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#51;&#94;&#50;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#55;&#125;&#32;&#61;&#32;&#92;&#100;&#102;&#114;&#97;&#99;&#123;&#50;&#125;&#123;&#51;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"39\" width=\"168\" style=\"vertical-align: -12px;\"\/><\/p>\n<h3>M\u00e9thode 3 : utiliser le PGCD et l&rsquo;algorithme d&rsquo;Euclide<\/h3>\n<p>Cette m\u00e9thode va au-del\u00e0 du programme de seconde, mais elle est la plus rapide avec de grands nombres. Le <strong>PGCD<\/strong> (plus grand commun diviseur) de deux entiers est le plus grand entier qui les divise tous les deux. En divisant le num\u00e9rateur et le d\u00e9nominateur par leur PGCD, on obtient directement une fraction irr\u00e9ductible.<\/p>\n<p>L&rsquo;<strong>algorithme d&rsquo;Euclide<\/strong> repose sur une propri\u00e9t\u00e9 : si <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-f85d45e207bc9898ba08b3647cba3074_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;&#32;&#61;&#32;&#98;&#113;&#32;&#43;&#32;&#114;\" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"79\" style=\"vertical-align: -4px;\"\/> est la division euclidienne de <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"\/> par <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-f56d50c26583f9a035ff6b4e3c0ca5c0_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#98;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"8\" style=\"vertical-align: 0px;\"\/>, alors PGCD<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-b5e1de4b01dce572d284772138620179_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#40;&#97;&#32;&#59;&#32;&#98;&#41;\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"37\" style=\"vertical-align: -5px;\"\/> = PGCD<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-56ec3a1c8f62bdcbdf99116754e8128d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#40;&#98;&#32;&#59;&#32;&#114;&#41;\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"36\" style=\"vertical-align: -5px;\"\/>. On encha\u00eene les divisions jusqu&rsquo;\u00e0 obtenir un reste nul. Le PGCD est le dernier reste non nul.<\/p>\n<p><em>Exemple avec 775 et 372 :<\/em><\/p>\n<ul>\n<li><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-eb637ec80c3d838728002393b3440d1e_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#55;&#55;&#53;&#32;&#61;&#32;&#50;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#51;&#55;&#50;&#32;&#43;&#32;&#51;&#49;\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"146\" style=\"vertical-align: -2px;\"\/><\/li>\n<li><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-4de8e3f8025a72bd1a9e919f3f9c977f_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#51;&#55;&#50;&#32;&#61;&#32;&#49;&#50;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#51;&#49;&#32;&#43;&#32;&#48;\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"138\" style=\"vertical-align: -2px;\"\/><\/li>\n<\/ul>\n<p>Le dernier reste non nul est 31, donc PGCD<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-25815c88eff069545a408fc926bac71c_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#40;&#55;&#55;&#53;&#32;&#59;&#32;&#51;&#55;&#50;&#41;&#32;&#61;&#32;&#51;&#49;\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"114\" style=\"vertical-align: -5px;\"\/> et :<\/p>\n<p dir=\"ltr\" style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5ef2214d9a42fa427bb3d3be404e9452_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#100;&#102;&#114;&#97;&#99;&#123;&#55;&#55;&#53;&#125;&#123;&#51;&#55;&#50;&#125;&#32;&#61;&#32;&#92;&#100;&#102;&#114;&#97;&#99;&#123;&#55;&#55;&#53;&#32;&#92;&#100;&#105;&#118;&#32;&#51;&#49;&#125;&#123;&#51;&#55;&#50;&#32;&#92;&#100;&#105;&#118;&#32;&#51;&#49;&#125;&#32;&#61;&#32;&#92;&#100;&#102;&#114;&#97;&#99;&#123;&#50;&#53;&#125;&#123;&#49;&#50;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"38\" width=\"166\" style=\"vertical-align: -13px;\"\/><\/p>\n<p>Le <strong>PPCM<\/strong> (plus petit commun multiple) de deux entiers positifs est le plus petit entier positif qui est un multiple des deux. Il donne le plus petit d\u00e9nominateur commun pour additionner deux fractions. Par exemple, PPCM<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-86a7b0af54a69b01d291deaf38318c04_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#40;&#54;&#32;&#59;&#32;&#49;&#53;&#41;&#32;&#61;&#32;&#51;&#48;\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"89\" style=\"vertical-align: -5px;\"\/>, donc :<\/p>\n<p dir=\"ltr\" style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-6ddc1218db36f859687a7587c2925411_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#100;&#102;&#114;&#97;&#99;&#123;&#49;&#125;&#123;&#54;&#125;&#32;&#43;&#32;&#92;&#100;&#102;&#114;&#97;&#99;&#123;&#49;&#125;&#123;&#49;&#53;&#125;&#32;&#61;&#32;&#92;&#100;&#102;&#114;&#97;&#99;&#123;&#53;&#125;&#123;&#51;&#48;&#125;&#32;&#43;&#32;&#92;&#100;&#102;&#114;&#97;&#99;&#123;&#50;&#125;&#123;&#51;&#48;&#125;&#32;&#61;&#32;&#92;&#100;&#102;&#114;&#97;&#99;&#123;&#55;&#125;&#123;&#51;&#48;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"37\" width=\"186\" style=\"vertical-align: -12px;\"\/><\/p>\n<p>Pour deux entiers positifs <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"\/> et <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-f56d50c26583f9a035ff6b4e3c0ca5c0_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#98;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"8\" style=\"vertical-align: 0px;\"\/>, PGCD<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-3e50a8561450b3e8e6e15afba5797d0a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#40;&#97;&#32;&#59;&#32;&#98;&#41;&#32;&#92;&#116;&#105;&#109;&#101;&#115;\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"50\" style=\"vertical-align: -5px;\"\/> PPCM<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-9d10b485c52afbf2627848e3a90f65b8_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#40;&#97;&#32;&#59;&#32;&#98;&#41;&#32;&#61;&#32;&#97;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#98;\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"100\" style=\"vertical-align: -5px;\"\/>. V\u00e9rification : <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-ca1dbd3cc2b0986ab726eedc902d880f_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#51;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#51;&#48;&#32;&#61;&#32;&#54;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#49;&#53;&#32;&#61;&#32;&#57;&#48;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"162\" style=\"vertical-align: 0px;\"\/>.<\/p>\n<p>&nbsp;<\/p>\n\t\t<div data-elementor-type=\"section\" data-elementor-id=\"206003\" class=\"elementor elementor-206003\">\n\t\t\t\t\t<div class=\"elementor-section-wrap\">\n\t\t\t\t\t\t\t\t<section class=\"has_ae_slider elementor-section elementor-inner-section elementor-element elementor-element-46248836 elementor-section-content-bottom full_width elementor-section-full_width elementor-section-height-min-height elementor-section-height-default ae-bg-gallery-type-default\" data-id=\"46248836\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;gradient&quot;}\">\n\t\t\t\t\t\t\t<div class=\"elementor-background-overlay\"><\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-narrow\">\n\t\t\t\t\t<div class=\"has_ae_slider elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-56fbe2a1 ae-bg-gallery-type-default\" data-id=\"56fbe2a1\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-3d9d711c elementor-widget elementor-widget-heading\" data-id=\"3d9d711c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">STAGE MATHS VACANCES<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-66976626 elementor-widget elementor-widget-heading\" data-id=\"66976626\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Se sentir mieux et viser haut en maths !<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-12080dd5 elementor-align-left elementor-mobile-align-center elementor-widget elementor-widget-button\" data-id=\"12080dd5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-md\" href=\"https:\/\/groupe-reussite.fr\/stages\/maths\/tous-niveaux\/france\/toutes-periodes\/\" target=\"_blank\" id=\"CTA_PRD_STAGE\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Stage de maths<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"has_ae_slider elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-382b6f23 ae-bg-gallery-type-default\" data-id=\"382b6f23\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\n<p>&nbsp;<\/p>\n<h2>Quelles erreurs \u00e9viter dans le chapitre d&rsquo;arithm\u00e9tique ?<\/h2>\n<ul>\n<li><strong>Confondre multiple et diviseur :<\/strong> 7 est un diviseur de 42, et 42 est un multiple de 7, pas l&rsquo;inverse.<\/li>\n<li><strong>Croire que 1 est premier :<\/strong> il n&rsquo;a qu&rsquo;un seul diviseur positif.<\/li>\n<li><strong>Oublier que 0 est pair :<\/strong> <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-cc1ebab55ec96ea03fcc10d67c84cf29_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#48;&#32;&#61;&#32;&#50;&#32;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#48;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"72\" style=\"vertical-align: 0px;\"\/>, et 0 est m\u00eame un multiple de tous les entiers.<\/li>\n<li><strong>Oublier les diviseurs n\u00e9gatifs<\/strong> quand l&rsquo;\u00e9nonc\u00e9 se place dans <img decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-e1ac530f2a83951115df3e0daa67b801_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#109;&#97;&#116;&#104;&#98;&#98;&#123;&#90;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"12\" style=\"vertical-align: 0px;\"\/>.<\/li>\n<li><strong>G\u00e9n\u00e9raliser la r\u00e8gle \u00ab divisible par 2 et par 3, donc par 6 \u00bb<\/strong> \u00e0 des nombres qui ont un diviseur commun, comme 4 et 6.<\/li>\n<li><strong>S&rsquo;arr\u00eater \u00e0 une fraction simplifi\u00e9e<\/strong> qui n&rsquo;est pas encore irr\u00e9ductible.<\/li>\n<li><strong>V\u00e9rifier sur un exemple au lieu de d\u00e9montrer :<\/strong> constater que <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-fcfa7ef9f782ab4a87e0b0dbe8ce0dfa_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#51;&#94;&#50;&#32;&#61;&#32;&#57;\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"49\" style=\"vertical-align: 0px;\"\/> est impair ne prouve pas la propri\u00e9t\u00e9 pour tous les entiers impairs.<\/li>\n<\/ul>\n<p>Pour vous entra\u00eener sur chacune de ces notions, retrouvez les <a href=\"https:\/\/groupe-reussite.fr\/ressources\/cours-en-ligne-exercices-corriges-arithmetique-seconde\/\">exercices corrig\u00e9s d&rsquo;arithm\u00e9tique en seconde<\/a>. Si les d\u00e9monstrations vous posent encore probl\u00e8me, un <a href=\"https:\/\/groupe-reussite.fr\/cours-particuliers\/maths\/tous-niveaux\/france\/\">prof de maths<\/a> peut reprendre avec vous la r\u00e9daction pas \u00e0 pas, en <a href=\"https:\/\/groupe-reussite.fr\/cours-particuliers\/toutes-matieres\/seconde\/france\/\">cours particuliers de seconde<\/a> ou lors d&rsquo;un <a href=\"https:\/\/groupe-reussite.fr\/stages\/toutes-matieres\/seconde\/france\/toutes-periodes\/\">stage intensif de seconde<\/a> pendant les vacances.<\/p>\n<h2>FAQ<\/h2>\n        <section class=\"sc_fs_faq sc_card \">\n            <div>\n\t\t\t\t<h3>C&#039;est quoi l&#039;arithm\u00e9tique en maths ?<\/h3>                <div>\n\t\t\t\t\t                    <p>\n\t\t\t\t\t\tL'arithm\u00e9tique est la partie des math\u00e9matiques qui \u00e9tudie les nombres entiers et leurs propri\u00e9t\u00e9s : multiples, diviseurs, parit\u00e9, nombres premiers. En seconde, elle sert surtout \u00e0 raisonner sur les entiers avec des lettres et \u00e0 \u00e9crire des fractions sous forme irr\u00e9ductible.                    <\/p>\n                <\/div>\n            <\/div>\n        <\/section>\n\t\t        <section class=\"sc_fs_faq sc_card \">\n            <div>\n\t\t\t\t<h3>Qu&#039;est-ce qui est au programme d&#039;arithm\u00e9tique en seconde ?<\/h3>                <div>\n\t\t\t\t\t                    <p>\n\t\t\t\t\t\tDepuis la rentr\u00e9e 2026, le programme comprend les notations \u2115 et \u2124, les notions de multiple, de diviseur, de nombre pair et de nombre impair, la pr\u00e9sentation des fractions sous forme irr\u00e9ductible et deux d\u00e9monstrations : la somme de deux multiples de a est un multiple de a, et le carr\u00e9 d'un nombre impair est impair.                    <\/p>\n                <\/div>\n            <\/div>\n        <\/section>\n\t\t        <section class=\"sc_fs_faq sc_card \">\n            <div>\n\t\t\t\t<h3>Les nombres premiers sont-ils au programme de seconde ?<\/h3>                <div>\n\t\t\t\t\t                    <p>\n\t\t\t\t\t\tLe programme de seconde publi\u00e9 au Bulletin officiel du 2 avril 2026 ne les cite pas. Ils ont \u00e9t\u00e9 \u00e9tudi\u00e9s au coll\u00e8ge et restent utiles en seconde pour d\u00e9composer un nombre et simplifier une fraction.                    <\/p>\n                <\/div>\n            <\/div>\n        <\/section>\n\t\t        <section class=\"sc_fs_faq sc_card \">\n            <div>\n\t\t\t\t<h3>Le nombre 1 est-il un nombre premier ?<\/h3>                <div>\n\t\t\t\t\t                    <p>\n\t\t\t\t\t\tNon. Un nombre premier a exactement deux diviseurs positifs distincts, 1 et lui-m\u00eame. Le nombre 1 n'a qu'un seul diviseur positif, donc il n'est pas premier. Le plus petit nombre premier est 2, qui est aussi le seul nombre premier pair.                    <\/p>\n                <\/div>\n            <\/div>\n        <\/section>\n\t\t        <section class=\"sc_fs_faq sc_card \">\n            <div>\n\t\t\t\t<h3>0 est-il un nombre pair ?<\/h3>                <div>\n\t\t\t\t\t                    <p>\n\t\t\t\t\t\tOui. Un nombre est pair s'il s'\u00e9crit 2k avec k entier, et 0 = 2 \u00d7 0. Z\u00e9ro est d'ailleurs un multiple de tous les entiers.                    <\/p>\n                <\/div>\n            <\/div>\n        <\/section>\n\t\t        <section class=\"sc_fs_faq sc_card \">\n            <div>\n\t\t\t\t<h3>Quelle est la diff\u00e9rence entre un multiple et un diviseur ?<\/h3>                <div>\n\t\t\t\t\t                    <p>\n\t\t\t\t\t\tSi a = k \u00d7 b avec k entier, a est un multiple de b et b est un diviseur de a. Par exemple, 42 = 6 \u00d7 7 : 42 est un multiple de 7, et 7 est un diviseur de 42. Un entier non nul a un nombre fini de diviseurs mais une infinit\u00e9 de multiples.                    <\/p>\n                <\/div>\n            <\/div>\n        <\/section>\n\t\t        <section class=\"sc_fs_faq sc_card \">\n            <div>\n\t\t\t\t<h3>Comment calculer le PGCD de deux nombres ?<\/h3>                <div>\n\t\t\t\t\t                    <p>\n\t\t\t\t\t\tAvec l'algorithme d'Euclide : on divise le plus grand nombre par le plus petit, puis le diviseur par le reste, et ainsi de suite. Le PGCD est le dernier reste non nul. Pour 126 et 84 : 126 = 1 \u00d7 84 + 42, puis 84 = 2 \u00d7 42 + 0, donc le PGCD vaut 42.                    <\/p>\n                <\/div>\n            <\/div>\n        <\/section>\n\t\t\n<script type=\"application\/ld+json\">\n    {\n\t\t\"@context\": \"https:\/\/schema.org\",\n\t\t\"@type\": \"FAQPage\",\n\t\t\"mainEntity\": [\n\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"C'est quoi l'arithm\u00e9tique en maths ?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"L'arithm\u00e9tique est la partie des math\u00e9matiques qui \u00e9tudie les nombres entiers et leurs propri\u00e9t\u00e9s : multiples, diviseurs, parit\u00e9, nombres premiers. En seconde, elle sert surtout \u00e0 raisonner sur les entiers avec des lettres et \u00e0 \u00e9crire des fractions sous forme irr\u00e9ductible.\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t,\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"Qu'est-ce qui est au programme d'arithm\u00e9tique en seconde ?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"Depuis la rentr\u00e9e 2026, le programme comprend les notations \u2115 et \u2124, les notions de multiple, de diviseur, de nombre pair et de nombre impair, la pr\u00e9sentation des fractions sous forme irr\u00e9ductible et deux d\u00e9monstrations : la somme de deux multiples de a est un multiple de a, et le carr\u00e9 d'un nombre impair est impair.\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t,\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"Les nombres premiers sont-ils au programme de seconde ?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"Le programme de seconde publi\u00e9 au Bulletin officiel du 2 avril 2026 ne les cite pas. Ils ont \u00e9t\u00e9 \u00e9tudi\u00e9s au coll\u00e8ge et restent utiles en seconde pour d\u00e9composer un nombre et simplifier une fraction.\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t,\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"Le nombre 1 est-il un nombre premier ?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"Non. Un nombre premier a exactement deux diviseurs positifs distincts, 1 et lui-m\u00eame. Le nombre 1 n'a qu'un seul diviseur positif, donc il n'est pas premier. Le plus petit nombre premier est 2, qui est aussi le seul nombre premier pair.\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t,\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"0 est-il un nombre pair ?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"Oui. Un nombre est pair s'il s'\u00e9crit 2k avec k entier, et 0 = 2 \u00d7 0. Z\u00e9ro est d'ailleurs un multiple de tous les entiers.\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t,\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"Quelle est la diff\u00e9rence entre un multiple et un diviseur ?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"Si a = k \u00d7 b avec k entier, a est un multiple de b et b est un diviseur de a. Par exemple, 42 = 6 \u00d7 7 : 42 est un multiple de 7, et 7 est un diviseur de 42. Un entier non nul a un nombre fini de diviseurs mais une infinit\u00e9 de multiples.\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t,\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"Comment calculer le PGCD de deux nombres ?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"Avec l'algorithme d'Euclide : on divise le plus grand nombre par le plus petit, puis le diviseur par le reste, et ainsi de suite. Le PGCD est le dernier reste non nul. Pour 126 et 84 : 126 = 1 \u00d7 84 + 42, puis 84 = 2 \u00d7 42 + 0, donc le PGCD vaut 42.\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t\t    ]\n}\n<\/script>\n\n<h2>Sources<\/h2>\n<ul>\n<li>Minist\u00e8re de l&rsquo;\u00c9ducation nationale, <a href=\"https:\/\/www.education.gouv.fr\/bo\/2026\/Hebdo14\/MENE2602914A\">Programme d&rsquo;enseignement de math\u00e9matiques de la classe de seconde g\u00e9n\u00e9rale et technologique<\/a>, arr\u00eat\u00e9 du 26 f\u00e9vrier 2026, Bulletin officiel n\u00b0 14 du 2 avril 2026, en application \u00e0 la rentr\u00e9e 2026.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Cours d&rsquo;arithm\u00e9tique en seconde : multiples, diviseurs, nombres pairs et impairs Par Seda Biber, mis \u00e0 jour le 22\/10\/2026 L&rsquo;arithm\u00e9tique est la partie des math\u00e9matiques qui \u00e9tudie les nombres entiers et la fa\u00e7on dont ils se divisent les uns par les autres. En seconde, le programme en vigueur depuis la rentr\u00e9e 2026 vous demande de [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"ocean_post_layout":"full-screen","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"ressource","ocean_second_sidebar":"0","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"0","ocean_custom_header_template":"0","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"0","ocean_menu_typo_font_family":"0","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"on","ocean_disable_heading":"on","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"on","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"0","footnotes":""},"class_list":["post-85316","page","type-page","status-publish","entry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - 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