Réponses

2012-11-21T17:06:31+01:00

moi : 

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

b(x)=(3x+1)²+(3x+1)(2x-4)

c(x)=x²-2x+1-(2x-5)²

d(x)=4(3x-1)²-9(x-1)²