8 Factoriser les expressions suivantes (sans effectuer de calcul). A=7 x 5+ 7 x 2 -3 × 7 B = 9 x a + 9 x 5 C = 10 × 4 - 4 x 3 + 4 x 1 D = 2a - 6 E = 6 × 4,3 - 1

Factorisation :

A=7 x 5+ 7 x 2 -3 × 7

=7(5+2-3)

B = 9 x a + 9 x 5

=9(a+5)

C = 10 × 4 - 4 x 3 + 4 x 1

=4(10-3+1)

D = 2a - 6

=2(a-3)

E = 6 × 4,3 - 1 x 6 + 6 x 6

=6(4,3-1+6)

F = 4 × 5 - 4

=4(5-1)

G=a × 4 – 4 x b

=4(a-b)

H = 3p – np + pp​

=p(3-n+p)