Bonsoir, jai un dm en math sur des équations aidez moi svp développer à max: A) 4x + 27 = 37 B) -3x + 20 = 0 C) 9x + 2 = -x - 37 D) x + 13 = 3(x- 1)

A) 4x + 27 = 37

4x = 37-27

4x=10

x = 10/4

x = 2.5

B) -3x + 20 = 0

-3x= -20

x = (-20) /( -3)

x = 20/3

C) 9x + 2 = -x - 37

9x+ x = -37-2

10x = -39

x = -39/10

x = -3.9

D) x + 13 = 3(x- 1)

x + 13 = 3x-3

x-3x = -3-13

-2x = -16

x = (-16) / (-2)

x = 8

Bonjour,

Réponse:

A) x = 2,5

B) x = 20/3

C) x = - 3,9

D) x = 8

Explications étape par étape:

4x + 27 = 37

4x = 37 - 27

4x = 10

x = 10/4

x = 5/2

x = 2,5

-3x + 20 = 0

3x = 20

x = 20/3

9x + 2 = -x - 37

9x + x = - 37 - 2

10x = - 39

x = -39/10

x = -3,9

x + 13 = 3(x - 1)

x + 13 = 3x - 3

13 + 3 = 3x - x

16 = 2x

16/2 = x

x = 8