计算x2-1/x2次方-2x+1÷x2次方+x/x-1

问题描述:

计算x2-1/x2次方-2x+1÷x2次方+x/x-1

(x²-1)/(x²-2x+1)÷(x²+x)/(x-1)
=(x+1)(x-1)/(x-1)²乘(x-1)/x(x+1)
=1/x