Réponses

2013-11-08T12:52:01+01:00
Bonjour

A= 3(x+5) = 3x +15
B=-2(5x-1) = - 10x + 2
C=-3a(6-5a) = - 18a +15a²
D=3x+5x(x-2) = 3x + 5x² -10x = - 5x² -7x
E=4a-2(3-5a) = 4a  - 6 +10a = 14a -6
F=3x+5x(4-2x)-2(x²-3x+5) = 3x + 20 -10x - 2x² + 6x -10 = -2x² -x +10
G=8+2x-2x(3x-4)+5x(3-x)
= 8 + 2x -6x² +8x +15x - 5x² = -11x² +25x +8