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
