实数xy满足 x-y+10 则y比X的取值范围为

实数xy满足 x-y+10 则y比X的取值范围为 已知实数xy满足x/y=x-y,且y>1,则实数x的取值范围是 已知正实数x,y满足2x+2y+xy=5 则xy的取值范围是什么? 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? 设实数x,y满足x^2+2xy-1=0则x+y的取值范围是 若实数x,y满足:xy=2-x,则x+2y的取值范围 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^2+2xy-1=0,则x+y的取值范围是 设正实数x,y满足xy=(x-4y)/(x+y),求y的取值范围 已知实数xy满足x^2+y^2=1,则（y+2)/(x+1)的取值范围是多少 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 实数x、y满足x^2;+xy+y^2;=2,记u=x^;-xy+y^2;,则u的取值范围是yiz 若正实数x.y满足x+y=xy,则x+2y的最小值 若正实数x ,y满足2x+y+6＝xy.则xy的最小值. 若实数xy满足x-y+10,y