{"id":22799,"date":"2026-07-30T13:58:22","date_gmt":"2026-07-30T13:58:22","guid":{"rendered":"https:\/\/ideerepas.milaf.ma\/?p=22799"},"modified":"2026-07-30T13:58:22","modified_gmt":"2026-07-30T13:58:22","slug":"seuls-1-des-gens-trouvent-le-bon-resultat-pour-4-4-4-4-5-x-0-et-vous-voir-le-1er-commentaire","status":"publish","type":"post","link":"https:\/\/ideerepas.milaf.ma\/?p=22799","title":{"rendered":"Seuls 1 % des gens trouvent le bon r\u00e9sultat pour \u00ab 4 + 4 + 4 + 4 + 5 \u00d7 0! \u00bb. Et vous ? Voir le 1er commentaire"},"content":{"rendered":"<p data-path-to-node=\"4\">Un nouveau d\u00e9fi math\u00e9matique enflamme les r\u00e9seaux sociaux ! \u00c0 premi\u00e8re vue, cette \u00e9quation affich\u00e9e sur un tableau blanc ressemble \u00e0 un exercice de calcul mental \u00e9l\u00e9mentaire. Et pourtant,\u00a0<b data-path-to-node=\"4\" data-index-in-node=\"188\">99 % des internautes tombent directement dans le pi\u00e8ge<\/b> en donnant une mauvaise r\u00e9ponse.<\/p>\n<p data-path-to-node=\"5\">Pensez-vous pouvoir faire mieux sans utiliser de calculatrice ? Regardez bien l&#8217;\u00e9quation :\u00a0<b data-path-to-node=\"5\" data-index-in-node=\"91\">4 + 4 + 4 + 4 + 5 \u00d7 0!<\/b><\/p>\n<h4 data-path-to-node=\"7\"><b data-path-to-node=\"7\" data-index-in-node=\"0\">Pourquoi cette \u00e9nigme pi\u00e8ge-t-elle autant de monde ?<\/b><\/h4>\n<p data-path-to-node=\"8\">Ce petit calcul accumule volontairement\u00a0<b data-path-to-node=\"8\" data-index-in-node=\"40\">deux pi\u00e8ges majeurs<\/b>\u00a0de la logique math\u00e9matique que beaucoup d&#8217;entre nous ont oubli\u00e9s depuis l&#8217;\u00e9cole.<\/p>\n<ol start=\"1\" data-path-to-node=\"9\">\n<li>\n<p data-path-to-node=\"9,0,0\"><b data-path-to-node=\"9,0,0\" data-index-in-node=\"0\">Le pi\u00e8ge du point d&#8217;exclamation (La factorielle) :<\/b><\/p>\n<p data-path-to-node=\"9,0,0\">La plupart des gens lisent \u00ab 0! \u00bb comme un simple chiffre z\u00e9ro suivi d&#8217;un point d&#8217;exclamation d&#8217;emphase. C&#8217;est la premi\u00e8re grosse erreur ! En math\u00e9matiques, le symbole\u00a0<b data-path-to-node=\"9,0,0\" data-index-in-node=\"219\">!<\/b>\u00a0d\u00e9signe la\u00a0<b data-path-to-node=\"9,0,0\" data-index-in-node=\"232\">factorielle<\/b>. Et par convention math\u00e9matique stricte,\u00a0<b data-path-to-node=\"9,0,0\" data-index-in-node=\"285\">la factorielle de z\u00e9ro (<span class=\"math-inline\" data-math=\"0!\" data-index-in-node=\"309\">$0!$<\/span>) est \u00e9gale \u00e0 1<\/b>\u00a0(et non \u00e0 0).<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"9,1,0\"><b data-path-to-node=\"9,1,0\" data-index-in-node=\"0\">Le pi\u00e8ge de la priorit\u00e9 des op\u00e9rations :<\/b><\/p>\n<p data-path-to-node=\"9,1,0\">L&#8217;autre erreur classique consiste \u00e0 calculer de gauche \u00e0 droite sans r\u00e9fl\u00e9chir. Or, la multiplication est toujours prioritaire sur l&#8217;addition.<!--nextpage--><\/p>\n<h4 data-path-to-node=\"11\"><b data-path-to-node=\"11\" data-index-in-node=\"0\">La r\u00e9solution \u00e9tape par \u00e9tape<\/b><\/h4>\n<div class=\"google-auto-placed ap_container\"><ins class=\"adsbygoogle adsbygoogle-noablate\" data-ad-format=\"auto\" data-ad-client=\"ca-pub-5148993367352938\" data-adsbygoogle-status=\"done\" data-ad-status=\"unfilled\"><\/p>\n<div id=\"aswift_4_host\"><\/div>\n<p><\/ins><\/div>\n<p data-path-to-node=\"12\">Pour trouver la solution exacte, il faut proc\u00e9der dans le bon ordre :<\/p>\n<ul data-path-to-node=\"13\">\n<li>\n<p data-path-to-node=\"13,0,0\"><b data-path-to-node=\"13,0,0\" data-index-in-node=\"0\">\u00c9tape 1 : Calculer la factorielle<\/b><\/p>\n<p data-path-to-node=\"13,0,1\"><span class=\"math-inline\" data-math=\"0! = 1\" data-index-in-node=\"0\">$0! = 1$<\/span><\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"13,1,0\"><b data-path-to-node=\"13,1,0\" data-index-in-node=\"0\">\u00c9tape 2 : Appliquer la priorit\u00e9 de la multiplication<\/b><\/p>\n<p data-path-to-node=\"13,1,1\">On multiplie\u00a0<span class=\"math-inline\" data-math=\"5\" data-index-in-node=\"13\">$5$<\/span>\u00a0par le r\u00e9sultat de\u00a0<span class=\"math-inline\" data-math=\"0!\" data-index-in-node=\"34\">$0!$<\/span>, ce qui donne :<\/p>\n<p data-path-to-node=\"13,1,2\"><span class=\"math-inline\" data-math=\"5 \\times 1 = 5\" data-index-in-node=\"0\">$5 \\times 1 = 5$<\/span><\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"13,2,0\"><b data-path-to-node=\"13,2,0\" data-index-in-node=\"0\">\u00c9tape 3 : Additionner le tout<\/b><\/p>\n<p data-path-to-node=\"13,2,1\">Il ne reste plus qu&#8217;\u00e0 faire la somme :<\/p>\n<p data-path-to-node=\"13,2,2\"><span class=\"math-inline\" data-math=\"4 + 4 + 4 + 4 + 5 = \\mathbf{21}\" data-index-in-node=\"0\">$4 + 4 + 4 + 4 + 5 = \\mathbf{21}$<\/span><\/p>\n<\/li>\n<\/ul>\n<h4 data-path-to-node=\"15\"><b data-path-to-node=\"15\" data-index-in-node=\"0\">Les mauvaises r\u00e9ponses les plus fr\u00e9quentes<\/b><\/h4>\n<ul data-path-to-node=\"16\">\n<li>\n<p data-path-to-node=\"16,0,0\"><b data-path-to-node=\"16,0,0\" data-index-in-node=\"0\">Ceux qui trouvent 16 :<\/b>\u00a0Ils ont oubli\u00e9 ce qu&#8217;\u00e9tait la factorielle et ont compt\u00e9\u00a0<span class=\"math-inline\" data-math=\"5 \\times 0 = 0\" data-index-in-node=\"79\">$5 \\times 0 = 0$<\/span>, puis\u00a0<span class=\"math-inline\" data-math=\"4 + 4 + 4 + 4 = 16\" data-index-in-node=\"100\">$4 + 4 + 4 + 4 = 16$<\/span>.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"16,1,0\"><b data-path-to-node=\"16,1,0\" data-index-in-node=\"0\">Ceux qui trouvent 0 :<\/b>\u00a0Ils ont tout additionn\u00e9 d&#8217;abord (<span class=\"math-inline\" data-math=\"4 + 4 + 4 + 4 + 5 = 21\" data-index-in-node=\"55\">$4 + 4 + 4 + 4 + 5 = 21$<\/span>) puis ont multipli\u00e9 par\u00a0<span class=\"math-inline\" data-math=\"0\" data-index-in-node=\"102\">$0$<\/span>.<\/p>\n<\/li>\n<\/ul>\n<p data-path-to-node=\"17\">La\u00a0<b data-path-to-node=\"17\" data-index-in-node=\"3\">seule et unique bonne r\u00e9ponse<\/b>\u00a0est donc\u00a0<b data-path-to-node=\"17\" data-index-in-node=\"42\">21<\/b>\u00a0!<\/p>\n<h4 data-path-to-node=\"19\"><b data-path-to-node=\"19\" data-index-in-node=\"0\">Et vous, quel r\u00e9sultat aviez-vous trouv\u00e9 au premier coup d&#8217;\u0153il ?<\/b><\/h4>\n<p data-path-to-node=\"20\">Avez-vous rep\u00e9r\u00e9 la factorielle tout de suite ou \u00eates-vous tomb\u00e9 dans le pi\u00e8ge du\u00a0<span class=\"math-inline\" data-math=\"16\" data-index-in-node=\"82\">$16$<\/span>\u00a0?<\/p>\n<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>Un nouveau d\u00e9fi math\u00e9matique enflamme les r\u00e9seaux sociaux ! \u00c0 premi\u00e8re vue, cette \u00e9quation affich\u00e9e sur un tableau blanc ressemble&hellip;<\/p>\n","protected":false},"author":1,"featured_media":22800,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-22799","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/ideerepas.milaf.ma\/index.php?rest_route=\/wp\/v2\/posts\/22799","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ideerepas.milaf.ma\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ideerepas.milaf.ma\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ideerepas.milaf.ma\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ideerepas.milaf.ma\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=22799"}],"version-history":[{"count":1,"href":"https:\/\/ideerepas.milaf.ma\/index.php?rest_route=\/wp\/v2\/posts\/22799\/revisions"}],"predecessor-version":[{"id":22801,"href":"https:\/\/ideerepas.milaf.ma\/index.php?rest_route=\/wp\/v2\/posts\/22799\/revisions\/22801"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ideerepas.milaf.ma\/index.php?rest_route=\/wp\/v2\/media\/22800"}],"wp:attachment":[{"href":"https:\/\/ideerepas.milaf.ma\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=22799"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ideerepas.milaf.ma\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=22799"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ideerepas.milaf.ma\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=22799"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}