Bonjour !! je n'arrive pas à faire ces équations, pourriez vous m'aider et me donner quelques explications?:/

1) 1= x/2 - 1/3
2) 3/2 x + 1/3 = 0
3) -3x/2 = - 2
4) -5x/3 + 2 = 5
5) -x/2 + 5 = -3
6) -7 = -7x + 7
7) x/4 + 4 = 1/4

Merci bcp !!!!

1

Réponses

2014-09-06T12:25:31+02:00
1)
1 =  x/2 - 1/3
6/6 = 3x/6 - 2/6
6 = 3x - 2
3x =  6 + 2
3x = 8
x = 8/3

2)
3/2x + 1/3 = 0
6/6x + 2/6 = 0
6x = - 2
x = -2/6
x = - 1/3

3)
-3x/2 = - 2
- 3x/2 = - 4/2
- 3x = - 4
x = 4/3

4)
-5x/3 + 2 = 5
- 5x/3 + 6/3 = 15/3
 - 5x = 15 - 6
5x = - 15 + 6
5x = - 9
x = - 9/5

5)
 -x/2 + 5 = -3
- x/2 + 10/2 = 6/2
- x/2 = 6/2 - 10/2
x = 10 - 6
x = 4

6)
-7 = -7x + 7
- 7 - 7 = - 7x
7x = 7 + 7
7x = 14
x = 14/7
x = 2

7)
 x/4 + 4 = 1/4
x/4 + 16/4 = 1/4
x/4 = 1/4 - 16/4
x = - 15