bjr pouvez vous m'aider merci

Bonjour,

12)

a) A = 2 (3x - 4)

A = 6x - 8

b) B = 5 (1 - 2x)

B = 5 - 10x

c) C = (3x + 7) * 7

C = 21x + 49

13)

A = 4 (3x + 2)

A = 12x + 8

B =  12 (x + 8)

B = 12x + 8

C = 2 (6x + 4)

C = 12x + 8

D = (2x + 3) * 4

D = 8x + 12 - Non

E = (3 + 6x) * 2

E = 6 + 12x - Non

F = 6 (2x + 2)

F = 12x + 12 - Non