x*根号x+x*根号y-y*根号x-y*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 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 =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) 已知x=2y,化简:根号y/根号x -根号y -根号y/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)=? 根号X*Y等于根号X*根号y吗?理由 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 已知根号X+根号Y+根号-X-16=0,求根号X+Y的平方根? (x+y)/(根号下x+根号下y)+2xy/(x根号下y+y根号下x)=______.