- Exercice 2. Résoudre les équations suivantes. a) -3x - 2 = 5x + 7 b) 2x + 4 = 3 + 4x c) 7x – 20 = 8x + 10 d) 5x + 13 = -3 + 7x e) -6x + 4 = 12 + 3x f) 5 + 9x

Bonjour,

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

A= -2 = 8x+7

A= -9 = 8x

x= -9/8 = -1.125

B= 2x+4 = 3+4x

B= 4 = 3+2x

B= 1 = 2x

x = 1/2 = 0,5

C= 7x-20 = 8x+10

C= -20 = x +10

C= -30 = x

x = -30

D= 5x+13 = -3+7x

D= 13 = -3 +2x

D= 16 = 2x

x= 16/2 = 8

E= -6x+4 = 12+3x

E= 4 = 12+9x

E= -8 = 9x

X= -8/9

F= 5+9x = 15+2x

F= 5+7x = 15

F= 7x = 10

x= 10/7

Bonne journée.

Salut ,

Réponse :

a) -3x - 2 = 5x + 7

  -3x -5x = 7 +2

   -8x = 9

  = 9/-8 = -1,125

b) 2x + 4 = 3 + 4x

    2x -4x = 3 -4

    -2x = -1

    = -1/-2 = 0,5

c) 7x – 20 = 8x + 10

   7x -8x = 10 +20

   -x = 30

   = 30/-1 = -30

d) 5x + 13 = -3 + 7x

   5x -7x = -3 -13

   -2x = -16

    = -16/-2 = 8

e) -6x + 4 = 12 + 3x

   -6x -3x = 12 -4

   -9x = 8

   = 8/-9

f) 5 + 9x = 15 + 2x

  9x -2x = 15 -5

  7x = 10

  = 10/7