Sagot :
Bonjour
Résous les équations suivantes, en te ramenant toujours à une
équation du type ax = b.
1) 2x +3 = x + 5
2x - x = 5 - 3
x = 2
2) 3x - 5 = 2x +9
3x - 2x = 9 + 5
x = 14
3) x + 3 = 2x-5
x - 2x = - 5 - 3
- x = - 8
x = 8
4) 8x - 3 = 4x +9
8x - 4x = 9 + 3
4x = 12
x = 12/4
x = 3
5) 2x +2 = 9-5x
2x + 5x = 9 - 2
7x = 7
x = 7/7
x = 1
6) 3-2x = -5
- 2x = - 5 - 3
- 2x = - 8
x = 8/2
x = 4.
Réponse :
1) 2x +3 = x + 5
2x - x = 5 - 3
x = 2
2) 3x - 5 = 2x +9
3x - 2x = 9 + 5
x = 14
3) x + 3 = 2x-5
x - 2x = - 5 - 3
- x = - 8
x = 8
4) 8x - 3 = 4x +9
8x - 4x = 9 + 3
4x = 12
x = 12/4
x = 3
5) 2x +2 = 9-5x
2x + 5x = 9 - 2
7x = 7
x = 7/7
x = 1
6) 3-2x = -5
- 2x = - 5 - 3
- 2x = - 8
x = 8/2
x = 4.
Explications étape par étape