如果实数xy满足x+2y>0 x-2y

已知实数xy满足x+2y 如果实数x,y满足2x的平方-6xy+9y的平方-4x+4=0 已知实数x,y满足x²+y²-xy+2x-y+1=0 求x y 若两个正实数x,y满足x^2+2xy-3y^2=0,求x^2+xy+y^2/x^2-xy+y^2 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满足2x2-7xy+3y2=0,求x：y 已知实数xy满足x²﹢y²-xy+2x-y+1=0求xy 已知实数x满足x^2+2xy+y^2-(x+y)-6=0则x+y的值 如果实数x,y满足2x^2-6xy+9y^2-4x+4=0,那么根号y= 若正实数x.y满足x+y=xy,则x+2y的最小值 已知实数xy,满足10x²-2xy+y²+6x+1=0,求x+y 若正实数x ,y满足2x+y+6＝xy.则xy的最小值.