计算:x²+x+1-(x³)/(x-1)

问题描述:

计算:x²+x+1-(x³)/(x-1)

x²+x+1-(x³)/(x-1)
=[(x-1)(x²+x+1)-x³]/(x-1)
=(x³-1-x³)/(x-1)
=-1/(x-1)