实数xy满足 x-y+10 则y比X的取值范围为

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x-y+1≤0,则y≥x+1,两边比上x(x>0)得,y/x≥1+1/x,
x取值范围是所有正数,所以y/x取值范围是1到∞.

实数xy满足 x-y+10 则y比X的取值范围为已知实数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? 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x2+y2=1则 xy的取值范围是? 设实数xy满足x2 +2y2=6,则x+y的取值范围已知实数xy满足x2+y2=4.则y+3/x+1的取值范围为已知实数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 若实数x,y满足2x*X+3y*y=1,S=3x*x-2y*y,则S的取值范围为已知实数x,y满足：x大于等于1,x+y小于等于1,x-2y小于等于0,则z=y^2-x^2/xy的取值范围为?