Pouvez vous m’aidez svp. Exercice 1 Résoudre les équations suivantes : a) x + 6 = 8 b) 7x =4 c) 5x = 3x + 3 d) 7x +1 = 4-X e 4(x + 5) = 10x + 3 f) 7x - (5x + 3)

Réponse :

bonjour,

a) x + 6 = 8

x = 8 - 6

x = 2

b) 7x =4

x = 4/7

c) 5x = 3x + 3

5x - 3x = 3

2x = 3

x = 3/2

d) 7x +1 = 4-x

7x + x = 4 - 1

8x = 3

x = 3/8

e) 4(x + 5) = 10x + 3

4x + 20 = 10x + 3

4x - 10x = 3 -20

-6x = -17

x = -17/-6

x = 17/6

f) 7x - (5x + 3) = 5(x-3)+2

7x - 5x - 3  = 5x - 15 + 2

7x - 5x - 5x = -15 + 2 + 3

-3x = -10

x = -10/3

x = 10/3

voila:)