Réponse :
42/
a) 3(x + 1) - 4 = 0
3x + 3 - 4 = 0
3x = - 1
x = -1/3
b) -2(x - 5) - 9 = 0
- 2x + 10 - 9 = 0
- 2x = -10 + 9 = -1
x = 1/2
c) -4x - 3(2x - 5) = 0
- 4x - 6x + 15 = 0
-10x = -15
x = 15/10 = 1,5
d) 7(-2x + 5) - 3(4 - 2x) = 0
- 14x + 35 - 12 + 6x = 0
-8x = - 23
x = 23/8
43/
a) (1+x)/2 - (2-x)/4 = 0
(2 + 2x - 2 + x) /4 = 0
3x/4 = 0
3x =
b) (x-5)/6 + 1 - (x-1)/3 = 0
c) 4 - (2x + 1)/5 - x - 3/10 = 0
d) (-3 - 5x)/14 - 2 - 4 - (-2x - 7)/21 = 0
Explications étape par étape
