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Sagot :

Réponse:

1.A=(x+7)(2x-5) - (2x-5)(3x+2)

=(2x-5)[(x+7)-(3x+2)]

=(2x-5)[x-3x+7-2]

=(2x-5)(2x+5)

2.B=(x+3)(6x+2) - (x+3)(x+3)

=(x+3)[(6x+2)-(x+3)]

=(x+3)[(6x+2-x-3)]

=(x+3)(5x-1)

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