bonjour
exercice 1
x + 11 = - 7
x = - 7 - 11
x = - 18
x/15 = 10/3
3 x = 150
x = 50
3 x - 5 = 2 x + 10
3 x - 2 x = 10 + 5
x = 15
d = comme b = produit en croix
3 x - 15 = 3 x + 2
3 x - 3 x = 2 + 15
0 x = 17 donc pas de solution
5 x - 5 = - 5 x - 5
5 x +5 x = - 5 + 5
10 x = 0
x = 0
- 4 x / 5 - 1 /5 = 6 x /5 + 3 /5
- 4 x / 5 - 6 x /5 = 3 /5 + 1 /5
- 10 x /5 = 4 /5
- 10 x = 4
x = - 4/10 = - 2 /5
exercice 2
2 ( 3 x + 3 + x + 3 ) = 36
6 x + 6 + 2 x + 6 = 36
8 x = 36 - 12
8 x = 24
x = 3
exercices 3 et 4 , tu utilises la distributivité
exercice 5
- 4 x + 7 = 13
- 4 x = 13 - 7
- 4 x = 6
x = - 6/4 = - 3 /2
5 x - 3 = 3 x + 11
5 x - 3 x = 11 + 3
2 x = 14
x = 7
