Réponses

Meilleure réponse !
2014-04-27T17:17:03+02:00
A) developper 

A= x²+x-x-1+x²-2x+1²
A=x²+x²-2x
A=2x²-2x

b) factoriser

b= (x-1) (x+1) + (x-1) (x-1)
b= (x-1) [(x+1) + (x-1)]
b= (x-1) [ x+1+x-1]
b= (x-1) (2x)