计算3x(x^2-x-1)-2x^2(1-x)

问题描述:

计算3x(x^2-x-1)-2x^2(1-x)

3x(x²-x-1)-2x²(1-x)
=3x³-3x²-3x-2x²+2x³
=5x³-5x²-3x