Réponses

2014-08-04T14:25:51+02:00
62) Résoudre les équations suivantes :

a)
3 (x - 6) = 18
3x - 18 = 18
3x = 18 + 18
3x = 36
x = 36/3
x = 12

b)
4 + (2 - y) = 20
4 + 2 - y = 20
- y = 20 - 4 - 2
- y = 20 - 6
- y = 14
y = - 14

c)
- 5 (2x + 3) = - 25
- 10x - 15 = - 25
- 10x = - 25 + 15
- 10x = - 10
x = 10/10
x = 1

d)
1 - 3 (2x + 4) = - 22
1 - 6x - 12 = - 22
 - 6x = - 22 - 1 + 12
 - 6x = - 23 + 12
- 6x = - 11
x = 11/6
  • Utilisateur Brainly
2014-08-04T14:45:49+02:00