Bonjour,
Résoudre des équations.
3*x+7 = 15*x-5
3x + 7 = 15x - 5
3x - 15x = - 5 - 7
- 12x = - 12
x = 12/12
x = 1
-2*x-20 = -x+13
- 2x - 20 = - x + 13
- 2x + x = 13 + 20
- x = 33
x = - 33
Quelles sont les solutions de :
(2*×-5)(-4*x+20)=0
2x - 5 = 0 ou - 4x + 20 = 0
2x = 5 - 4x = - 20
x = 5/2 x = 20/4 = 5.