Résulion d'inéquation


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La résolution d'inéquations est la démarche qui permet de déterminer l'ensemble-solution des valeurs possibles d'une inconnue qui valident l'inéquation. Résoudre une équation ou une inéquation consiste à trouver toutes les valeurs que la variable peut prendre pour valider l'équation de départ.

Comment résoudre une inéquation f x )> 0 ?

a/ Pour résoudre l'inéquation f(x) < 0, on repère la portion de courbe au dessous de l'axe des abscisses (Ox) : les abscisses correspondantes donnent l'ensemble solution.
. Si l'inéquation à étudier est f(x) ? 0, on prend également les abscisses des points d'intersection. donnent l'ensemble solution.

Comment résoudre une inéquation à deux inconnues ?

Résoudre graphiquement un système d'inéquations linéaires à deux inconnues, c'est représenter dans un repère l'ensemble des points M dont les coordonnées (x ; y) vérifient simultanément toutes les inéquations du système.
. Exemple : Résolution graphique du système ? ? ? < + <- - 27 3 4 09 2 3 x y y x .

Comment résoudre une inéquation avec la calculatrice ?

Résolution : Pour résoudre une inéquation du premier degré à une inconnue on peut : ajouter ou soustraire un même nombre aux deux membres de l'inéquation. multiplier ou diviser les deux membres de l'inéquation par un même nombre strictement positif sans changer le sens de l'inégalité.










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