Réponses

2014-04-05T17:20:18+02:00
-9x-3-2-x=0
-10x-5=0
-10x=5
x=5/-10
x=-1/2

4x-20+21-14x=-15x-5
-10x+1=-15x-5
-10x+5=-15x
5=-5x
x=5/-5
x=-1
2014-04-05T18:28:59+02:00
Résoudre chaque équation :


a) -3 (3x + 1) - (2 + x) = 0
- 9x - 3 - 2 - x = 0
-10x - 5 = 0
-10x = 5
x = 5/10
x = 1/2

b)
4 (x - 5) + 7 (3 - 2x) = - 5 (3x + 1) 
4x - 20 + 21 - 14x = -15x - 5
-10x + 1 = -15x - 5
-10x + 15x = -5 - 1
5x = - 6
x = -6/5