{(x-y)/(根号x+根号y)}-(x+y-2倍根号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)=?
x根号x+x根号y/xy-y^2)-(x+根号xy+y/x根号x-y根号)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
化简:((根号x-根号y)^3+2x根号x+y根号y)/(x根号x+y根号y)+(3根号xy-3y)/(x-y)
已知y=根号(x-8)+根号(8-x)+18,求代数式[(x+y)/(根号x+根号y)]-2xy/(x根号y-y根号x)
已知y=根号1-x+根号x-1+3,求根号x+根号y分之x+2根号xy+y+根号x-根号y分之一的值
(x+y)/(根号下x+根号下y)+2xy/(x根号下y+y根号下x)=______.
化简:(x-y)除以(根号x+根号y)-(x-2根号xy+y)除以(根号x-根号y)
代数式求值.已知x=2,y=根号3,求 (根号x-根号y)/(根号x+根号y)+(根号x+根号y)/(根号x-根号y)
已知,x=484,y=2.56,求x+y-2倍根号xy、根号x-根号y
已知x =2y 化简(根号y/根号x -根号y )-(根号y/根号x +根号y)
已知x=2y,化简根号y/(根号x-根号y)-根号y/(根号x+根号y)