若x>0,化简根号-9x/y=______.
若x>0,化简根号下-9x/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)/(根号下x+根号下y)+2xy/(x根号下y+y根号下x)=______.
若根号x+根号负x+根号y-9=0,求x+y的算术平方根
若根号下x+根号下-x-9=0,求x+y的算术平方根
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
化简求值:根号x^-2xy+y^2 + x^2 -6xy+9y^2/x-3y,其中x=根号3,y=根号5
若根号2x+y+|x平方-9| ---------------------- =0,求3x+6y的立方根.根号3-x
已知 x-3*根号(xy)-4y=0,则 [2x+3*根号(xy)-2y]/[3x-根号(xy)+y]=______
若根号下x+y+x的平方-9的绝对值=0,x-y=
设x>1,y>0,若x^y+x^-y=2根号2,则x^y-x^-y等于
设x小于0,y小于0,则x*根号y/x-1/y*根号x*y的立方-根号x的立方*y化简为: