Bonjour,
3/4x = 5
x = 5 * 4/3
x = 20/3
4x - 3 = 11
4x = 11 + 3
4x = 14
x = 14/4 = 7/2
6x - 4 = 3x + 14
6x - 3x = 14 + 4
3x = 18
x = 18/3 = 6
9 - 2x = 11 + 4x
- 2x - 4x = 11 - 9
-6x = 2
x = -2/6 = -1/6
Réponse:
1)
3/4x=5
x=5x(4/3)
x=20/3
2) 4x-3=11
4x= 11+3
4x= 14
x= 14/4
x=7/2
3)
7-8x=56
-8x=56-7
-8x=49
x=49/-8
x=- 49/8
4)
6x-4=3x-14
6x-4=3x=14
3x-4=14
3x=14+4
3x=18
x=18/3
x=6
5)
9-2x=11+4x
9-2x-4x=11
9-6x=11
-6x=11-9
-6x=2
x=2/-6
x=- 1/3
En espérant que cela va t'aider :)