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Sagot :

Bonjour,

Factoriser:

7x+42= 7(x+6)

64-x²= -(x-8)(x+8)

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

81x²-5²= (9x-5)(9x+5)

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