计算:( 根号xy-xy/x+根号xy)÷根号xy-y/x-y=
先化简,在求值:(x+根号xy)/(y+根号xy)+((根号xy)-y)/(x-根号xy),其中x=根号3+1,y=根号
x根号x+x根号y/xy-y^2)-(x+根号xy+y/x根号x-y根号)y
计算 (xy-y2分之x根号x+x根号y)-(x根号x-y根号y分之x+根号xy+y)
若x>0,y>0,且x-根号下xy-2y=0,求【2x-根号下xy】÷【y+2根号下xy】的值
①{(x+y)/(根号x+根号y)}+{2xy/根号xy(根号x+根号y)}
{(x-y)/(根号x+根号y)}-(x+y-2倍根号xy)/(根号x-根号y)=?
已知x>0,y>0,且x+6y=5根号xy,求(2x+根号xy-y)分之(x+根号xy+2y)的值
已知正实数x y满足x-根号xy-2y=0求 x+3根号xy+2y/2x-2根号下xy-y
已知:x>0,y>0,x-2y=根号xy.求(x+(根号xy)+y)/(x-(根号xy)-y)
已知根号x(根号x-根号y)=根号xy+3y,求(3x-y)分之2x+3倍根号xy-y 的值
已知x>0,y>0,x+根号xy-6y=0,求4x+5根号xy-6y分之x+2根号xy
x-4根号(xy)-5y=0(根号x - 5根号y)(根号x+ 根号y)=0为什么