y-3/4y-8÷(5/y-2-y-2) 计算`

问题描述:

y-3/4y-8÷(5/y-2-y-2) 计算`

原式 = y/4 - 8y/(1-y)(5+y) = (y^2-4y+27)y/4(y-1)(y+5)