aidez moi s'il vous plait​

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