vous pouvez m 'aider pou le 3 et 3 et 5 svpppppp​

Réponse :

Explications étape par étape

Bonjour

Exercice 3 :

(2x + 8)/8 - (3x + 2)/4 = (-7x + 7)/2

(2x + 8)/8 - 2(3x + 2)/8 = 4(-7x + 7)/8

2x + 8 - 6x - 4 = -28x + 28

28x + 2x - 6x = 28 - 8 + 4

24x = 24

x = 24/24

x = 1

Exercice 4 :

(9x + 6)/4 - (7x + 6)/3 = (3x + 8)/6

3(9x + 6)/12 - 4(7x + 6)/12 = 2(3x + 8)/12

27x + 18 - 28x - 24 = 6x + 16

-x - 6x = 16 - 18 + 24

-7x = 22

x = -22/7

Exercice 5 :

(8x - 1)/6 - (x + 10)/9 = (2x - 9)/2

3(8x - 1)/18 - 2(x + 10)/18 = 9(2x - 9)/18

24x - 3 - 2x - 20 = 18x - 81

22x - 18x = 23 - 81

4x = -58

x = -58/4

x = -(2 x 29)/(2 x 2)

x = -29/2