Bonjour
Résoudre les quatre équations suivantes.
3х + 7 = 0
3x = - 7
x = - 7/3
7x- 11 = 4x + 10
7x - 4x = 10 + 11
3x = 21
x = 21/3
x = 7
9-x= 7+x
- x - x = 7 - 9
- 2x = - 2
x = 2/2
x = 1
2x+5= 3x +9
2x - 3x = 9 - 5
- x = 4
x = - 4.
Réponse :
3x + 7 = 0
3x= 0 - 7
3x = -7
x= -7/3
7x- 11 = 4x + 10
7x -4x =10 + 11
3x = 21
x= 21/3
x=7
9-x= 7+x
-x-x = 7-9
-2x= -2
x= -2/-2
x= 1
2x+5= 3x +9
2x-3x = 9-5
-x=4
x= -4