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EXERCICE 5: Factorise et réduis chaque expression suivante :
A = 5x (x - 1) + 2(x - 1)
B = 2x (x - 3) + (x-3)
C = (3y + 7)(2y - 9) + (3y + 7)(5y - 7)
D = (2y + 5)2+ (2y + 5)(-3y + 1)
E = (3x + 5)(2x - 9)-(3x + 5)?

Sagot :

Réponse:

A=5x^2 - 3x - 2

B=2x^2 - 5x - 3

C=21y^2 - y -112

D=-6y^3 + 6y

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