Explications étape par étape:

bonjour

A = 3x + 6

B = 7x - 42

C = x + 5

D = 20 - 4x

E = 1,6x - 0,8

F = 4x + 4

G = 21x - 56

H = 12x + 54

Bonjour,

k*(a+b) = k(a+b) = ka + kb

k*(a-b) = k(a-b) = ka - kb

A = 3(x + 2)

= 3x + 6

B = 7(x - 6)

= 7x - 42

C = 1(x + 5)

= x + 5

D = 4(5-x)

= 20 - 4x

E = 1,6(x-0,5)

= 1,6x - 0,8

F = 4(x+1)

= 4x + 4

G = 7(3x-8)

= 21x - 56

H = 6(2x+9)

= 12x + 54