若x^2+y^2+2x+2y+1=0则x+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?
方程组中:x+2y=1+m ,2(x+1)>14-x,若未知数x,y 满足x+y>0,则m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x^2+y^2-6x-4y+12=0,则x^2+y^2的取值范围是
1.若2x-y=0,且x-5>y,则x、y的取值范围是x=____,y=____.
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 ?
设x、y满足约束条件{x≥0 y≥x 4x+3y≤12}则2y+3/x+1的取值范围是?
已知y=(2x-1)/(x-1) 且x>0 则实数y的取值范围是?
方程组x+2y=1+m2x+y=3中,若未知数x、y满足x+y>0,则m的取值范围是( )
已知实数x,y满足x^2+y^2-6x-8y+24=0,则3x+4y-10的取值范围是
已知变量x、y满足x-y-2≤0,x+2y-5≥0,y-2≤0,则m=(2x-y-1)/(x+2y+1)的取值范围是?
若点P(x,y)在圆X^2十y^2十4x十3=0上,则y/x的取值范围是