计算5x(x^2-2x+4)+x^2(x-1)
问题描述:
计算5x(x^2-2x+4)+x^2(x-1)
答
5x(x^2-2x+4)+x^2(x-1)
=5x^3-10x^2+20x+x^3-x^2
=6x^3-11x^2+20x