Réponses

2013-11-24T22:56:41+01:00
Bonsoir,

a= - 4x(y-3)+(3x-1)(y+1)-7y(x-1)\\\\a= - 4xy+12x+3xy+3x-y-1-7xy+7y\\\\a= 15x+6y- 8xy-1

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b=(x-4)^2 - 3x(x^2-1)\\\\b=x^2-8x+16 - 3x^3+3x\\\\b=-3x^3+x^2-5x+16