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).
