Bonjour je n’arrive pas unexercice de maths pouvez-vous m’aider?

Réponse :

a.

2x = 6

2x/2 = 6/2

x = 3

b.

3x = 33

3x/3 = 33/3

x= 11

c.

x - 9 = 4

x = 4+9

x = 13

d.

2x+6=0

2x = - 6

x = -6/2

x= -3

e.

3x-6=9

3x = 9 + 6

3x = 15

x = 15/3

x = 5

f.

5x + 2 = x

5x + 2 - x = 0

4x + 2 = 0

4x = -2

x = -2/4

x = -0,5

g.

2×(x+3) = x

2x + 6 = x

2x - x + 6 = 0

x + 6 = 0

x = -6

h.

x + 6 = 3×(x+1)

x + 6 = 3x + 3

x + 6 - 3x = 3

-2x + 6 = 3

-2x = 3 - 6

-2x = -3

-2x/(-2) = (-3)/(-2)

x = 1,5