Bonjour
Résoudre les équations suivantes :
a) (5x+1)(8-x)=0
5x + 1 = 0 ou 8 - x = 0
4x = - 1 - x = - 8
x = - 1/4 x = 8
b) (5x+1)+(8-x)=0
5x + 1 + 8 - x = 0
5x - x = - 1 - 8
4x = - 9
x = - 9/4
c) ((x+1)-(8-x)=0
x + 1 - 8 + x = 0
x + x = - 1 + 8
2x = 7
x = 7/2
d)-3(5x+1)+2(8-x)=0
- 15x - 3 + 16 - 2x = 0
- 15x - 2x = 3 - 16
- 17x = - 13
x = 13/17.