Réponses

2012-09-22T15:36:31+02:00
2012-09-22T15:49:03+02:00

A) 2x - 5 = 3x -3

3x-2x = -5 + 3

x = -2

 

B) 2 (x+1) = -2(-x-4)

2x + 2 = 2x + 8

2 = 8 impossible l'équation est fausse

 

C) -3+x= - 3 (-2-5x)+1

-3 + x - 15x  = 1 + 6

- 14x  = 1 + 6 + 3

x = -10/14

x = -5/7

 

D) 6-2(x+3) = -3(x-2) -6

6 - 2x - 6 = -3x + 6 - 6

2x = 3x

x = 0

 

E) 2-3(4-2x) = 5 (x-2) - 2(x-2)

2 - 12 + 6x = 5x - 10 - 2x + 4

6x - 3 x = 4

3x = 4

x = 4/3

 

En espérant t'avoir aidé.