Réponses

2012-10-15T20:30:54+02:00

A = -6x-15x²-6x²-14

=-21x²-6x-14

 

B= 7x-(-10x+16x²-15+24x)

=7x+100x-16x²+15-24

= -16x²+83x+15

 

C= x²+7x-3x-21+2x²+16x-3x-24

=3x²+17x-45