x的三次方减x的二次方减x减2,
问题描述:
x的三次方减x的二次方减x减2,
答
x^3-x^2-x-2
=x^3-2x^2+x^2-2x+x-2
=x^2(x-2)+x(x-2)+x-2
=(x^+x+1)(x-2)
答
x^3-x^2-x-2
==X^3-2X^2+X^2-X-2
=X^2(X-2)+(X^2-X-2)
=X^2(X-2)+(X-2)(X+1)
=(X^2+X+1)(X-2)