设实数x、y满足x+2xy-1=0,则x+y的取值范围是
设实数x,y满足x2+y2=1则 xy的取值范围是?
设实数X,Y满足X^2+2XY-1=0,则XY的取值范围是?这个是对的
已知实数xy满足x/y=x-y,且y>1,则实数x的取值范围是
(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______.
设实数x,y满足x2+2xy-1=0,则x+y的取值范围是______.
设实数xy满足x2 +2y2=6,则x+y的取值范围
设实数x,y,满足[(x^2)/16]+[(y^2)/9]=1,则[(y-4)/x](x≠0)的取值范围是?
设实数XY满足x^2+(y-1)^2=1若对满足条件xy不等式y/(x-3)+c≥0恒成立,则c的取值范围是( )
设实数xy满足x+y-3≤0,y-x/2≥0,x-1≥0,则求u=y/x-x/y的取值范围
已知实数x,y满足xy+1=4x+y,若x,y为正实数,则xy的取值范围是?
已知x、y是实数且满足x2+xy+y2-2=0,设M=x2-xy+y2,则M的取值范围是______.
已知X.Y是实数且满足X^2+XY+Y^2-2=0,设M=X^2-XY+Y^2,则M的取值范围是