计算：x²+x+1-(x³)/(x-1)

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计算：x²+x+1-(x³)/(x-1)
计算：x²+x+1-(x³)/(x-1)

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)

2/(x-1)+1-x

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