(x-2分之x-1)/2-x分之4x
问题描述：
(x-2分之x-1)/2-x分之4x
答
=(x-1)/(x-2) ÷[-4x/(x-2)]
=(x-1)/(x-2)×(x-2)/(-4x)
=-(x-1)/4x
=(1-x)/4x