计算x²-1/x²-2x+1+x²-2x/x-2÷x要过程

问题描述:

计算x²-1/x²-2x+1+x²-2x/x-2÷x要过程

原式=(x+1)(x-1)/(x-1)²-x(x-2)/(x-2)÷x
=(x+1)/(x-1)-1
=(x+1-x+1)/(x-1)
=2/(x-1)