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Sagot :

Réponse :

A=(2x+3)(-4x+1+2x+3)=(2x+3)(-2x+4)

B=(4-5x)(8x+1-7x+5)=(4-5x)(x+4)

C=(7-2x)(4+3x-3x-4)=(7-2x)(0)=0

D=(9x-4)(2x+1+9x+4)=(9x-4)(11x+5)

E=(2x-9)(x-7+3)=(2x-9)(x-4)

F=(7x+1)(12-6x+5-x)=(7x+1)(17-7x)

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