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大于等于0恒成立,则c的取值范围

设实数x,y满足x^2+2xy+4y^2=1,则x+2y最大值 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 设实数x,y满足x平方+2xy-1=0,求x+y的取值范围 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+1/2y²4-xy+2y=0.则x=___,y=___ 设实数xy满足x^2+(y-1)^2=1,求x^2+y^2的范围,y+2/x+1的最值 设正实数x,y,z满足x^2+y^2+z^2=1,求证x^2yz+y^2xz+z^2xy 若实数 x,y满足x^2+xy+2y^2=1,设2x+y 则S的最大值为 设实数X,Y满足x²+2xy+4y²=1,则x+2y的最大值为 .PS： 已知实数xy满足x²﹢y²-xy+2x-y+1=0求xy 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 不等式 (17 18:40:20)设实数x,y满足x^2+2xy-1=0,则x+y的取值范围是多少? 设实数x.y满足x平方+y平方=2,求x平方+2xy-y平方的最大值