(2根号x-3根号y)2-(3根号x-2根号y)2
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)
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
求导数 y=(x*根号x根号x根号x)/3次根号x^2
【(x-y)^3(x^1/2+y^1/2)^-3+3(x根号y-y根号x)】/(x根号x+y根号y)+(2xy根号xy-
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
已知x、y为实数,且根号x²=根号3-根号2,根号y平方=根号2,x+y≠根号3,求x-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
根号2x+根号3y=2根号6 根号3x-根号2y=1 急
解方程组根号2 x+根号3y=5 根号 3x+根号2 y=2根号6