DÉVELOPPER ET FACTORISER LES EXPRESSION SUIVANTES :
B=(-x+2)(3x-4)+(-x-7)(2x-1)
C=(2x-5)(8-x)-(3x+1)(x-6)
B=(-x+2)(3x-4)+(-x-7)(2x-1)
C=(2x-5)(8-x)-(3x+1)(x-6)
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=-3x²+4x+6x-8-2x²+1-14x+7
=-5x²-4x-1
C=(2x-5)(8-x)-(3x+1)(x-6)
=16x-2x²-40+5x-(3x²-18x+x-6)
=16x-2x²-40+5x-3x²+18x-x+6
=-5x²+39x-34