Réponses

2013-01-31T14:35:58+01:00

1) A car 3*(-2)+5 = -6+5 = -1

2) B

3) D

4) B car 4x(x-2)=4x²-8x

5) C car 15a²-5a=5a*3a-5a*1=5a(3a-1)

6) B

7) C car 3(x-2)-(-3x+8)=3x-6+3x-8=6x-14

8) A car (-b+5)-2(4-3b)=-b+5-8+6b=5b-3

9) C car (5x-2)(2x-3)=10x²-4x-15x+6=10x²-19x+6

10) C

11) D

12) A mais aussi D