Réponses

2012-11-13T19:11:32+01:00

A =(2x-6)(7-3x)

A=14x-6x²-42+18x

A= -6x²+28x-42

 

B= 5(8-4x)²

B=5(64-64x+16x²)

B=5(64)-5x(64x)+5(16²)

B=.....

 

C= -(-x+10)+2(x²+5)+x(8-2x)

C=x-10+2x²+10+8x-2x²

c=....