化简:根号(4y^5)-(4xy^4)+(x^2y^3)(y>1/2x)

化简:根号(4y^5)-(4xy^4)+(x^2y^3)(y>1/2x) 4根号【(x方+xy+y方)/x-y】*1/2根号【(x方-xy加y方)/x+y】*3根号【(x3次方+y3次方】（x＞ 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) 【(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- 先化简再求值(x+y)(x-y)-(4x的立方y-8xy的立方)/2xy,其中x=-1,y=3/根号3 已知x>0,y>0,x+根号xy-6y=0,求4x+5根号xy-6y分之x+2根号xy （x-y/x+2y)/(x^2-y^2/x^2+4xy+4y^2),其中x=1-根号2 y=根号2-2 已知根号x+2y=3;根号4x-2y=4求xy 若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( ) 已知X—根号3XY-4Y=0,求（2X+3根号XY-2Y)/(3X-根号XY+Y）的值 已知 x-3*根号(xy)-4y=0,则 [2x+3*根号(xy)-2y]/[3x-根号(xy)+y]=______ 计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2)