Mathématiques - 3ième Bonjour à tous. Je ne comprends pas ces exercices, pouvez-vous m'aidez à trouver les réponses en m'expliquant si possible. Merci d'avance.

1) Parmi les expressions suivantes, lesquelles sont des produits ?

A = 7x5 B = 5 ( 7+2 ) C = 3x+2 D = ( x+7)(x-4) E = (3x+2)(x-5)

- Dans cette question, j'ai répondu la A, La B, La D et la E.

2)a) Sans développer les calculs, indiquer, parmi les produits suivants, ceux qui sont nuls (justifier les réponses).

F = 3x2x1x0x1x2x3 G = (7-1)(-4+4) H = (3-2)(2-1)(1-1)(0-1)

- J'ai mis que toutes les équations sont nuls car on ne peux pas multiplié un facteur si le nombre est nul.

b) D'après les exemples précédents, à quelle condition un produit de facteurs est-il nul ?

- J'ai répondu, quand un des facteurs est nul.

3) On considère maintenant un produit de 2 facteurs axb.

Si l'on sait que ce produit est nul, que peut-on en déduire pour a et b.

- On peut en déduire qu'un des 2 facteurs (a ou b) est nul.

4)a) Résoudre chacune des équations x-7 = 0 et 2x+1 = 0

b) Donner les solutions de l'équation-produit (x-7)(2x+1) = 0

J'ai besoin d'aide pour ces deux dernières questions car je ne comprends pas, si vous voyez des erreurs dans les autres questions vous pouvez me le dire.
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