x²+4x+4/x²-4 - x/x-2,做下吧.

问题描述:

x²+4x+4/x²-4 - x/x-2,做下吧.

由(x²+4x+4)/(x²-4)-x/(x-2)
=(x+2)²/(x+2)(x-2)-x/(x-2)
=(x+2)/(x-2)-x/(x-2)
=2/(x-2).