解:原式=(x-2)²/x(x-2)÷ x²-4/x
=(x-2)²/x(x-2)* x/x²-4
=(x-2)²/x(x-2)* x/(x+2)(x-2)
=1/x+2
当x=2时
原式=1/4
打出来的,看着很辛苦,我已经尽量打清楚点了,望采纳
1/x+2,望采纳谢谢啦
x-2/x^2-4 取-1或1 得 1或1/3