Bonsoir
Résoudre les équations suivantes en appliquant les méthodes étudiées :
a) 2x + 7 + 3 – 5x = 0
2x - 5x = - 7 - 3
- 3x = - 10
x = 10/3
b) (2x + 7) + (3 - 5x ) = 0
2x + 7 = 0 ou 3 - 5x = 0
2x = - 7 - 5x = - 3
x = - 7/2 x = 3/5
2x + 7 + 3 - 5x = 0
2x - 5x = - 7 - 3
- 3x = - 10
x = 10/3
2x - 5x = - 7 - 3
- 3x = - 10
x = 10/3
c) (2x + 7) x (3-5x ) = 0
2x + 7 = 0 ou 3 - 5x = 0
2x = - 7 - 5x = - 3
x = - 7/2 x = 3/5.
d) (2x + 7) – (3 - 5x ) = 0
2x + 7 - 3 + 5x = 0
2x + 5x = - 7 + 3
7x = - 4
x = - 4/7
e) 2x + 7 = 3 - 5x
2x + 5x = 3 - 7
7x = - 4
x = - 4/7
f) (2x + 7) = (3-5x)
2x + 5x = 3 - 7
10x = - 4
x = - 4/10
g) 2x - 7 = 3 + 5x
2x - 5x = 3 + 7
- 3x = 10
x = - 10/3.
