Réponses

2013-04-21T14:45:26+02:00

A= 9-x-y+x+7 = -y+16

B= -8a-10 

C=3y-6+5y²+5y = 5y²+8y-6

D=(x+3)(2x+5)  

   =2x²+5x+6x+15

   =2x²+11x+15

2013-04-21T15:07:15+02:00