x的立方/x-1 -x的平方 -x -1怎么算
问题描述:
x的立方/x-1 -x的平方 -x -1怎么算
答
=x³/(x-1)-(x²+x+1)
=x³/(x-1)-(x-1)(x²+x+1)/(x-1)
=x³/(x-1)-(x³-1)/(x-1)
=1/(x-1)