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Sagot :

Bonsoir,

factoriser:

(2x-6)(1-x)+(x²-9)= (2x-6)(1-x)+(x-3)(x+3)= 2(x-3)(1-x)+(x-3)(x+3)

                          = (x-3) [ 2(1-x)+x+3 ]= (x-3)(2-2x+x+3)= (x-3)(-x+5)= - (x-3)(x-5)

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