[x/(x-2)-x/(x+2)]÷4x/(2-x)
=[x/(x-2)-x/(x+2)]×(2-x)/4x
=[(x+2-x+2)/(x+2)(x-2)]*(2-x)/4
=-1/(x+2)
这样可以么?才一种复制去Google翻译翻译结果