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EXERCICE 4:
Factoriser les expressions suivantes :
y A = (x + 1)( 3 − x)+ (x+1)(2 + 5x)
B = (x + 2)(x + 1) + (x + 2)(7x - 5)
C = (x+3)(3-2x) - (x+3)(5 + x)
D = (2x + 1)(x - 5)-(3x + 1)(2x + 1)
E = (x-6)(2-x)-(2-x)(3+4x)

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