计算:{x√x+x√y / xy-y²}-{x+√xy+y / x√x-y√y}

问题描述:

计算:{x√x+x√y / xy-y²}-{x+√xy+y / x√x-y√y}

原式=x(√x+√y)/y(√x+√y)(√x-√y)-(x+√xy+y)/(√x-√y)(x+√xy+y)
=x/y(√x-√y)-y/y(√x-√y)
=(√x+√y)/y