如果根号下x-3+根号下3-x +2y=4,求xy值

已知X+Y=—3,XY=2求根号下x/y+根号下y/x的值 已知y=根号下（x-4）+根号下（4-x）+3,求代数式（x-y+4xy/x-y)(x+y-4xy/x+y)? 已知x+y=5,xy=3,求根号下x/y+根号下y/x的值 已知正实数x y满足x-根号xy-2y=0求 x+3根号xy+2y/2x-2根号下xy-y 已知根号下X+根号下Y=根号下5+根号下3,根号下xy=根号下15减根号下3,求X+Y的值 已知根号下X+根号下Y=根号下5+根号下3 求x²+3xy+y²的值 若X>0,y>0,且x-根号下xy-2y=0,求(2x-根号下xy)/y+2根号下xy的值 若x>0,y>0,且x-根号下xy-2y=0,求【2x-根号下xy】÷【y+2根号下xy】的值 已知[x+根号下(x^2+2008)][y+根号下(y^2+2008)]=2008,求x^2-3xy-4y^2-6x-6 已知实数x、y满足y=根号下x-3+（根号下3-x）加12,求根号下xy的值 (x+y)/(根号下x+根号下y)+2xy/(x根号下y+y根号下x)=______. 已知x+y=5 xy=3 求根号下y/x+根号下x/y