(xx-8x+16)/(xx-4x+4)+[1+2/(x-2)][1+2/(x-2)]=2x/(x-2)
(x-4)^2/(x-2)^2+[1+2/(x-2)]^2=2x/(x-2)
[1-2/(x-2)]^2+[1+2/(x-2)]^2=2x/(x-2)
1+[2/(x-2)]^2=x/(x-2)
（x-2）^2+4=x（x-2）
2x=8
x=4