x√x+x√y)/(xy-y2)-(x+√xy+y)/(x√x-y√y)化简
(√xy -xy分之x+√xy)除以√xy -y分之x-y(x>0,y.0)
化简:(x+y)÷(√x-√y)-2xy÷(x√y-y√x)
帮个忙啦 已知x+y=-6 xy=8 求√y/x+√x/y
√x(√x+2√y)=√y(6√x+5√y,求x-3√xy+2y/x+√xy-6y
√xy+y分之一+√xy+x分之一等于多少,
√xy/x+√xy/y怎么算
已知y=√(x-8)+√(8-x)+18,求代数式 (x+y)/(√x-√y)-2xy/(x√x-y√x) 的值
先化简再求值(6x√y/x +3/y*√xy^3)-(4x√x/y +√36xy) 已知X=3/2,y=27
解方程xy'=(√x^2-y^2)+y
x²/xy-x/y
xy-1+x-y
将(√x-y)/(x-y)÷√(xy/x³-x²y)(x>y>0)化简