Bonjour
Résoudre les équations.
a) -7x + 13 = 0
- 7x = - 13
x = 13/7
b) 5 = -2x - 7
- 2x = 7 + 5
- 2x = 12
x = - 12/2
x = - 6
c) 3x – 18 = 5x + 3
3x - 5x = 18 + 3
- 2x = 21
x = - 21/2
d) 3(x - 1) - 2(5x - 3) = 7x + 2
3x - 3 - 10x + 6 = 7x + 2
3x - 10x - 7x = 2 + 3 - 6
- 14x = - 1
x = 1/14.
Bonjour,
a) -7x + 13 = 0
13 = 7x
x= 13/7
b) 5 = -2x - 7
2x= -7-5
2x= -12
x = -12/2 =-6
c) 3x – 18 = 5x + 3
-18 -3 = 5x-3x
-21 = 2x
x= -21/2 = -10,5
d) 3(x - 1) - 2(5x - 3) = 7x + 2
3x-3 -10x +6 = 7x+2
3x-10x -7x = 2 +3 -6
-14x = -1
x = -1/-14 = 1/14