On voit un panneau \u201cJe parie que tu as tort !\u201d, on fonce\u2026 et on tr\u00e9buche sur l\u2019ordre des op\u00e9rations. Pas de panique : avec la bonne routine, ces pi\u00e8ges viraux deviennent des formalit\u00e9s.
\nLa r\u00e8gle \u00e0 m\u00e9moriser (sans acronymes compliqu\u00e9s)<\/p>\n
Parenth\u00e8ses d\u2019abord.
\nMultiplications et divisions ensuite, de gauche \u00e0 droite.
\nAdditions et soustractions enfin, toujours de gauche \u00e0 droite.<\/p>\n
Deux points essentiels :<\/p>\n
Multiplication et division ont la m\u00eame priorit\u00e9 : on les r\u00e9sout dans l\u2019ordre o\u00f9 elles apparaissent.
\nM\u00eame principe pour addition et soustraction.
\nL\u2019exercice pi\u00e9geux
\nExpression :<\/p>\n
Copier le code<\/p>\n
2 + 2 + 2 + 2 + 2 \u00f7 2 + 2<\/p>\n
\u00c9tape 1 \u2014 Division en premier (car aucune parenth\u00e8se) :<\/p>\n
Rep\u00e9rez 2 \u00f7 2 = 1.<\/p>\n
Nouvelle expression :<\/p>\n
Copier le code<\/p>\n
2 + 2 + 2 + 2 + 1 + 2<\/p>\n
\u00c9tape 2 \u2014 Additions de gauche \u00e0 droite :<\/p>\n
2 + 2 = 4
\n4 + 2 = 6
\n6 + 2 = 8
\n8 + 1 = 9
\n9 + 2 = 11<\/p>\n
R\u00e9sultat final : 11<\/p>\n
Pourquoi tant d\u2019erreurs ?<\/p>\n
Lecture pr\u00e9cipit\u00e9e de gauche \u00e0 droite, sans appliquer la priorit\u00e9 de la division.
\nAjout mental de parenth\u00e8ses qui n\u2019existent pas.
\nConfusion entre \u201cla multiplication passe avant la division\u201d (en r\u00e9alit\u00e9, elles ont le m\u00eame rang).
\nAntis\u00e8ches express
\nRep\u00e9rez d\u2019abord toutes les divisions\/multiplications et r\u00e9solvez-les dans l\u2019ordre d\u2019apparition.
\nEnsuite seulement, g\u00e9rez les additions\/soustractions.
\nSi une expression vous semble floue, ajoutez des parenth\u00e8ses pour visualiser correctement la hi\u00e9rarchie des calculs.
\nLe \u201cvrai\u201d pi\u00e8ge moderne
\nLes expressions compactes comme 8 \u00f7 2(2+2) font souvent d\u00e9bat sur Internet car elles sont ambigu\u00ebs. La bonne pratique ? Toujours ajouter des parenth\u00e8ses pour expliciter votre intention. C\u2019est la cl\u00e9 pour faire partie du 1 % qui ne se trompe jamais.<\/p>\n","protected":false},"excerpt":{"rendered":"
On voit un panneau \u201cJe parie que tu as tort !\u201d, on fonce\u2026 et on tr\u00e9buche sur l\u2019ordre des op\u00e9rations.…<\/p>\n","protected":false},"author":1,"featured_media":22576,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-22575","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\/22575","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=22575"}],"version-history":[{"count":1,"href":"https:\/\/ideerepas.milaf.ma\/index.php?rest_route=\/wp\/v2\/posts\/22575\/revisions"}],"predecessor-version":[{"id":22577,"href":"https:\/\/ideerepas.milaf.ma\/index.php?rest_route=\/wp\/v2\/posts\/22575\/revisions\/22577"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ideerepas.milaf.ma\/index.php?rest_route=\/wp\/v2\/media\/22576"}],"wp:attachment":[{"href":"https:\/\/ideerepas.milaf.ma\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=22575"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ideerepas.milaf.ma\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=22575"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ideerepas.milaf.ma\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=22575"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}