(x²/x-2+4/2-x)÷x+2/2x
=(x²/x-2-4/x-2)÷x+2/2x
=(x²-4)/(x-2)÷（x+2)/2x
=(x+2)(x-2)/(x-2)÷(x+2)/2x
=2x
如追加其它问题,