设实数x,y满足y≥x+1,2x-4y-1≤0 ,2y+x-11≤0 则y²/x的取值范围是

设实数x,y满足2x+y≤4,x-y≥-1,x-2y≤2,则z=x+y的最大值为 设实数x,y满足x-y-2≥0,x+2y-4≥0,2y-3≤0(1)2x+y的最小值为 设实数x、y满足不等式组1≤x+y≤4和y+2≥|2x-3|,试求(x,y)所在的平面区域 设实数x,y 满足x²+4y²+2x-4y+2+0 则x+y= 设实数X,Y满足2X+Y-2>=0,X-2Y+4>=0,3X-Y 设正实数x,y满足x^3+y^3=x-y,求证：x^2+4y^2 设实数x,y满足x^2+2xy+4y^2=1,则x+2y最大值 设实数X,Y满足X^2+Y^2=1,则3X+4Y的最大值为多少 设实数x,y满足 x>=0 x-2y>=0 x-y-2 设实数x,y满足约束条件：x>=2;y>=x;2x+y 设实数x,y满足x的平方+4y的平方+2x 设实数x和y满足约束条件,x+y≤10,x-y≤2,X≥4,则Z=2x+3y的最小值为? 1.设x,y满足2x+y-4≥0,x-y-1≥0,x-2y-2≤0,则z=x+y有无最大与最小值?是多少?2.实数x,y满足不等式组y≥0,x-y≥0,2x-y-2≥0,则w=y/x的取值范围? 设实数x,y满足不等式|x|+|y| 设实数x,y满足3 设实数x,y满足3 设实数x,y满足0 不等式：设实数x,y满足3