急分式加减计算5x/y-3+2x/3-y
问题描述:
急分式加减计算5x/y-3+2x/3-y
答
5x/y-3+2x/3-y
=5x/(y-3)-2x/(y-3)
=(5x-2x)/(y-3)
=3x/(y-3)