Exercice 7: Développer et réduire les expressions suivantes :
A = 5 * (a +9)
B = 7 * (6 - b)
C = 4 (b − 3) +9
D = (d – 2g + 3c) x 10

Exercice 8:
Factoriser au maximum les expressions suivantes :
E = 12 + 6a
F= 21 - 7g
H= 3x + 3x?
1 = 60x’y - 15xy?
G= 18ac - 14ab
J= 24ab – 12a + 18a

aidez moi svp​
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