若实数x,y满足|x-y|+(y-2)2=0,则xy的值为______.
已知正实数x,y满足xy+2x+y=4,则x+y的最小值为______.
已知实数x、y满足x2+4xy+4y2+x+2y-6=0,则x+2y的值为______.
已知正实数x、y满足x+2y=xy,则2x+y的最小值等于______.
若实数x,y满足根号x-2 +(3-y)^2=0,则代数式xy-x的值为
若实数xy满足(x+y+2)(x+y-1)=0,则x+y的值是
若实数x,y满足xy+x+y+7=0,3x+3y=9+2xy,则x2y+xy2=______.
若正实数x.y满足x+y=xy,则x+2y的最小值
若实数x y满足x^2+Y^2=4,则-2xy/(x+y+2)的最小值为?
若实数x.y满足x^2+y^2+xy=1,则x+y的最大值为
若实数x,y满足2x−y≥0y≥xy≥−x+b 且z=2x+y的最小值为3,则实数b的值为( )
(2008•杭州一模)设实数x,y满足x2+2xy-1=0,则x+y的取值范围是______.
已知实数x满足x^2+2xy+y^2-(x+y)-6=0则x+y的值