计算:{x√x+x√y / xy-y²}-{x+√xy+y / x√x-y√y}
计算:(xy-x²)×x-y/xy
(√xy -xy分之x+√xy)除以√xy -y分之x-y(x>0,y.0)
(x^2+xy/x-y)/(xy/x-y)计算
x²/xy-x/y
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
化简:(x+y)÷(√x-√y)-2xy÷(x√y-y√x)
计算(x-y)(x平方+xy+y平方)-(x+y)(x平方-xy+y平方)
解方程xy'=(√x^2-y^2)+y
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
x-y/xy-y^2计算
xy-1+x-y