bonjour
2 x - 7 = 8 x+ 3
2 x - 8 x = 3 + 7
- 6 x = 10
x = - 10/6 = - 5 /3
3 a - 12 = 8 - 2 +a
3 a - a = 8 - 2 + 12
2 a = 18
a = 9
7 m - 7 - 3 m = 4 m + 8
4 m - 4 m = 8 + 7
0 m = 15 pas de solution
5 y - 15 + 2 y < 3 y - 12 - 11
7 y - 3 y < - 23 + 15
4 y < - 8
y < - 2
] - ∞ ; - 2 [
- 2 x /5 = 3
- 6 x = 5
x = - 5/6
x /2 = ( x- 5 ) / 4
4 x = 2 x - 10
4 x - 2 x = - 10
2 x = - 10
x = - 5
9 x - 5 x - 12 = 4 x - 12
4 x - 4 x = - 12 + 12
0 x = 0
donc tout nombre est solution
Irène = 2 ( x + 3 ) = 2 x + 6
Jacques = 3 x - 1
2 x + 6 = 3 x - 1
2 x - 3 x = - 1 - 6
- x = - 7
x = 7
2 ( x + 2.5 ) = 3 ( x - 1 )
2 x + 5 = 3 x - 3
2 x - 3 x = - 3 - 5
- x = - 8
x = 8
