Réponses

2014-04-28T20:43:47+02:00
A) 4x+11=2x+15
4x+11 -11 = 2x +15 -11
4x= 2x +4
4x-2x=2x+4-2x
2x=4
x=4/2 = 2

b) 3x+2= 2x-5
3x+2 -2x = 2x -5 -2x
x +2 -2 = -5 -2
x= -7

c) 5x-3 = x-5
5x-3-x = x-5 -x
4x -3 +3 = -5 +3
4x= -2
x= -2/4

d) 7x+5 = -3x+2
7x+5 +3x = -3x +2 +3x
10x +5 -5 = 2 -5
10x= -3
x= 10/-3

J'espère t'avoir aider :)
2014-04-28T20:44:49+02:00
Salut :)

a) 4x + 11 =2x +15
2x + 11 = 15
2x = 4
x = 4/2
x = 2

b) 3x +2 = 2x-5
x + 2 = -5
x = -7

c) 5x -3 = x-5
4x - 3 = -5
4x = -2
x = -2/4
x = -1/2

d) 7x +5 = -3x +2

10x + 5 = 2
10x = -3
x = -3/10

J'espère t'avoir aidé(e) ! :)