Exercice 1 :

1) Factoriser le plus possible :

A = 3(2x+1)-6x(2x+1)

2) a) Développer puis réduire l'expression : B = (a+1) (a+1)

b) En déduire (a+1)²

3) C = (x-1) (-5x+2)

D = -5x (x-2) - (3x+2)

Démontrer que C = D

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