若实数xy满足(x^2+y^2+2)(X^2+y^2-1)=0,则x^2+y^2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x^2+y^2+xy=1,则x+y的最大值为
若正实数x.y满足x+y=xy,则x+2y的最小值
若实数x,y满足根号x-2 +(3-y)^2=0,则代数式xy-x的值为
若实数x y满足x^2+Y^2=4,则-2xy/(x+y+2)的最小值为?
已知实数x满足x^2+2xy+y^2-(x+y)-6=0则x+y的值
若实数x,y满足1/x-1/y=5,则分式3x-2xy-3y/x+xy-y的值等于?
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( )
已知实数x,y满足xy+1=2x+y,且x>1,则(x+1)(y+2)的最小值为 ___ .
若x.y都是实数,且满足y=根号x-4 + 根号4-x + 1 ,求3(-xy+2x)-2(3x-y)的值
已知实数x y满足x×x+y×y-xy+2x-y+1=0 试求x y的值
若对满足条件x+y+3=xy(x>0,y>0)的任意x,y,(x+y)2-a(x+y)+1≥0恒成立,则实数a的取值范围