若实数xy满足y≤2x+3,且y=x^2,则y/(x-12)的取值范围是
若实数xy满足y≤2x+3,且y=x^2,则y/(x-12)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
若实数X Y满足y=2x+1,且x小于等于2y大于等于3,则y/x的取值范围是 ?
若实数x,y满足:xy=2-x,则x+2y的取值范围
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
若对满足条件x+y+3=xy(x>0,y>0)的任意x,y,(x+y)2-a(x+y)+1≥0恒成立,则实数a的取值范围
已知正实数x,y满足2x+2y+xy=5 则xy的取值范围是什么?
实数X.Y满足X*X+Y*Y-2X-2Y+1=0,则(Y-4)/(X-2)的取值范围是?
若实数x,y,z满足x^2+y^2+z^2=1且x+y+z=0,则实数xy+yz+zx的取值范围是
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?
若实数x,y满足x^2+y^2-6x-4y+12=0,则x^2+y^2的取值范围是
若实数xy满足2x²+3y²=1,S=3x²-2y²,则S的取值范围是