Résoudre les équations suivantes : a) -3 + x = 1 b) 2x = x+4 c) 5x + 3 = 4x + 5 d) x/3 =1 e) x/-5 = -9 f) 2/7x=6 merci pour votre aide :)

Bonjour,

a) -3 + x = 1

x= 1+3

x = 4

b) 2x = x+4

2x-x = 4

x=4

c) 5x + 3 = 4x + 5

5x-4x = 5-3

x = 2

d) x/3 =1

x = 1*3

x= 3

e) x/-5 = -9

x= -9*-5

x = 45

Excuse moi pour l'erreur.

f) 2/7x=6

7x = 6/2

7x =3

x= 3/7

Réponse :

bonjour,

a) -3 + x = 1

x = 1 + 3

x = 4

b) 2x = x+4

2x - x = 4

x = 4

c) 5x + 3 = 4x + 5

5x - 4x = 5 -3

x = 2

d) x/3 =1

x/3 × 3 = 1 × 3

x = 3

e) x/-5 = -9

x/-5 × (-5) = -9 ×(-5)

x = 45

f) 2/7x=6

2/7 x × 7 = 6 × 7

2x = 42

x = 42/2

x = 21

voila :)