化简x(x2-3)+x2(x-3)-3x(x2-x-1)

问题描述:

化简x(x2-3)+x2(x-3)-3x(x2-x-1)

x(x^2-3)+x^2(x-3)-3x(x^2-x-1)
=x^3-3x+x^3-3x^2-3x^3+3x^2+3x
=-x^3