已知实数x y满足x-2y=3,则根号x2+y2最值是多少?

已知实数x.y满足根号(x+y-8)+根号(8-x-y)=根号(3x-y-4)+根号(x-2y+7),求x,y 已知实数x,y满足下x^2+根号2y=根号3,y^2+根号2x=根号3,求x/y+y/x 已知实数x,y满足3x+4y=5,则根号x^2+y^2的最小值等于 已知实数x,y满足3x+4y=5,则根号x^2+y^2的最小值等于 已知实数x,y满足(x-根号x^2-2008)(y-根号y^2-2008)=2008 ,则3x^2-2y^2+3x-3y-2007已知实数x,y满足【x-根号下（x^2-2008）】【y-根号下（y^2-2008)】=2008 ,则3x^2-2y^2+3x-3y-2007的值是 已知实数x,y 满足 x^2+根号下2*y=根号3 ,y^2+根号下2*x=根号3 x不等于y 则x/y+y/x的值是多少? 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 已知实数x,y,z满足x+y+z=2根号x-1+2根号y-1+2根号z-1求X+2Y+3Z 已知x,y都为实数,满足y=根号x-2+根号2-x+3,xy的值? 已知实数x,y满足 根号x-2 + (y+1)²=0,则x-y等于 已知实数x,y满足根号x-2+（y+1）²=.,则x-y 等于 1.已知实数x,y满足x=(根号y-3 )+(根号3-y)+2,求x的y次方的值.2.若根号x+根号-x有意义,则x1.已知实数x,y满足x=(根号y-3 )+(根号3-y)+2,求x的y次方的值.2.若根号x+根号-x有意义,则x应满足（ ）.3.已知|2008-a|+ 1.已知实数x,y满足x=(根号y-3 )+(根号3-y)+2,求x的y次方的值.2.若根号x+根号-x有意义,则x1.已知实数x,y满足x=(根号y-3 )+(根号3-y)+2,求x的y次方的值.2.若根号x+根号-x有意义,则x应满足（ ）.3.已知|2008-a|+ 已知实数x,y满足x^+y^+2x-2根号3y=0(1)x^+y^的最大值 （2）x+y的最小值 已知实数x y满足x-2y=3,则根号x2+y2最值是多少? 已知实数x,y,满足x^2-xy+y^2-根号3x-根号3y+3/2=0,则xy 已知实数x,y满足x^2+根号2y=根号3且x不等于y求x+y和xy的值已知实数x,y满足x^2+根号2y=根号3,y^3+根号2x=根号3，且x不等于y，求x+y和xy的值 已知实数X,Y满足3X-Y=4的根号2,2X+Y=根号2,求X+Y的值?