Răspunsuri

2014-10-21T16:32:47+03:00
A³-b³=(a-b)(a²+ab+b²)
(x+1-x-2)(x²+2x+1+x²-x-2+x²-4x+4)=-(3x²-3x+3)=-3x²+3x-3=-3(x²-x+1)