若实数x、y满足条件x²-y²=1,则(1/x²)+(2y/x)的取值范围是?
若实数x、y满足条件x²-y²=1,则(1/x²)+(2y/x)的取值范围是?
若实数x,y满足2x²+3y²=1,S=3x²-2y²,则S的取值范围是
实数x,y满足x+y≤2,(x-1)²+(y-1)²≤2,则2x+y的取值范围是
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满足{x-y+1≥,x>0},则y/(x-1)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2x*X+3y*y=1,S=3x*x-2y*y,则S的取值范围为
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 ?
实数x,y满足x²-2x-4y=6,记t=x-2y,则t的取值范围是
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
若实数xy满足2x²+3y²=1,S=3x²-2y²,则S的取值范围是
已知实数x,y满足x²+y²-2y=0,(1)求2x+y的取值范围