已知实数xy满足x+2y

已知实数xy满足x+2y 已知实数xy满足x²﹢y²-xy+2x-y+1=0求xy 已知实数x、y满足2x2-7xy+3y2=0,求x：y 已知实数xy,满足10x²-2xy+y²+6x+1=0,求x+y 已知实数x,y满足x²+y²-xy+2x-y+1=0 求x y 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 已知正实数x,y满足2x+2y+xy=5 则xy的取值范围是什么? 已知x y都是实数 且满足x^2+y^2+xy=1/3,求xy的最大值 已知实数x,y满足x^2+y^2=1 求(1-xy)(1+xy)的最大值和最小值 已知实数x,y满足x^2+2y^2+2x+2=2xy,求x,y 已知实数x满足x^2+2xy+y^2-(x+y)-6=0则x+y的值 已知实数x、y满足xy>0,且8/xy+1/x+1/y=1,