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Sagot :

1) Factoriser 6x-3
=3(2x-1)

2) en déduire une factorisation de : A = 6x-3 - (2x-1)²
=
3(2x-1)-(2x-1)²
=3(2x-1)-(2x-1)(2x-1)
=(2x-1)(3-2x-1)
=(2x-1)(2-2x)
=2(2x-1)(1-x)

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