根号X+根号Y=根号2009(过程)
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根号x+x根号y/xy-y^2)-(x+根号xy+y/x根号x-y根号)y
y=根号下(x+根号x) 求导
已知x,y为正数,且根号x(根号x+根号y)=3根号y(根号x+5根号y),求:(2x+根号xy+3y)/(x+根号xy
已知:y=根号x-2+根号2-x+3,求根号3x+y的值 要求有过程,
解数学根号题x>0,y>0, 且根号x(根号x + 根号y )=3倍根号x(根号x +5倍根号y )时,求 2x+根号x
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))
已只y=根号x-3+根号3-x-5,求三次根号x-y的平方根(要过程)
{(x-y)/(根号x+根号y)}-(x+y-2倍根号xy)/(根号x-根号y)=?