Bonsoir,

8)

a. 57 x 99 + 57 x 1 = 57 x (99 + 1) = 57 x 100 = 5 700

b. 212 x 1 003 - 212 x 3 = 212 x (1 003 - 3) = 212 x 1 000 = 212 000

c. 177 x 5 + 177 x 2 + 177 x 3 = 177 x (5 + 2 + 3) = 177 x 10 = 17 700.

9)

E = 12 - 8x

E = 4 (3 - 2x)

F = 9 - 72x

F = 9 (1 - 8x)

G = - 6x - 18

G = - 6 (x + 3)

H = 42 - 14x

H = 14 (3 - x).