化简求值：(1- x-1分之x)÷1/x2-x,其中x=2.

题目

化简求值：(1- x-1分之x)÷1/x2-x,其中x=2.
(1- x-1分之x)÷1/x平方-x

答案

{1-x/(x-1)}÷1/x(x-1)
=(x-1-x)/(x-1)÷1/x(x-1)
=-1/(x-1)÷1/x(x-1)
=-x