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Sagot :

Bonsoir,

factoriser :

A=7a+56b= 7(a+8b)

B=(2x+3)²-(4x-7)(2x+3)​

  = (2x+3)(2x+3-4x+7)= (2x+3)(-2x+10)= 2(2x+3)(-x+5)= - 2 (2x+3)(x-5)

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