Réponses

2013-09-29T15:37:17+02:00
a) 3x-8=6x+2
3x - 6x = 2 + 8
-3x = 10
x = -10/3

b) 2(x-3)=2x-6
= 2 * x + 2 * (-3) = 2x - 6
= 2x + (-6) = 2x - 6
= 2x - 2x = -6 + 6
x = 0

c)2x-3=x+7
= 2x - x = 7 + 3
= x = 10

d) 5x+2-x-8=3x-4+7x
5x - 3x - 7x - x = -4 - 2 + 8
2x - 6x = -6 + 8
-4x = 2
x = -0,5

Pour les 2 dernières, je ne sais pas faire.