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x,y满足x2-2xy-1=0 则x-y的取值范围是 若实数x,y满足x2+y2+x2y2-4xy+1=0,则(x+y)2的值为 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x2+y2=1则 xy的取值范围是________. 设实数x,y满足x^2+2xy-1=0则x+y的取值范围是 设实数x,y满足x^2+2xy-1=0,则x+y的取值范围是 设实数x,y满足x^2+2xy-1=0,则x+y的取值范围是 设实数X,Y满足X平方+2XY-1=0,则X+Y的取值范围是多少? 设实数x、y满足x+2xy-1=0,则x+y的取值范围是 若实数XY满足X2+Y2=1,则X-2Y的最大值为 已知实数x、y满足X2+y2-xy+2x-y+1=0,试求x、y的值 已知实数x,y满足(x2)+(y2)-xy+2x-y+1=0,求x,y的值 已知实数x、y满足X2+y2-xy+2x-y+1=0,试求x、y的值 若实数x,y满足x2+y2+xy=1,则x+y的最大值是 若实数x,y满足x2+y2+xy=1,则x+y的最大值是 已知实数x、y满足2x2-7xy+3y2=0,求x：y 设实数x,y,z满足x2+y2+z2-xy-yz-zx=27,则|y-z|的最大值为? 设正实数xyz满足x2-3xy+4y2-z=0,则当（xy）/z取得最大值时,2/x+1/y-2/z的最大值为