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Sagot :

Réponse :

a) 2x² + 5x +6x

a)x(2x+5+6)

a) x(2x+11)

b) (x+5)(2x-3) - (4x+7)(x+5)​

b)(x+5)((2x-3)-(4x+7))

b)(x+5)(2x-3-4x-7)

b)(x+5)(-2x-10)

b)-2(x+5)(x+5)

b)-2(x+5)²

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