已知x=2y,y=0,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
已知x=2y,化简根号y/(根号x-根号y)-根号y/(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4x2+9y-4x-6y+2=0 求根号y/根号x+根号y - 根号y/根号x-根号y
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x平方+y平方-2y+1=0,求(根号x+根号y+3)/((根号xy+y)(3根号x+根号y))
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)