设实数x,y满足不等式组{x+2y-5>0 2x+y-7>0 x>=0 y>=0} ,且x,y为整数,则3x+4y的最小值是?

不等式：设实数x,y满足3 设实数x,y满足不等式|x|+|y| 设Z=x+y,其中实数x,y满足不等式x+2y>=0,x-y 设实数x,y满足不等式组{x+2y-5>0 2x+y-7>0 x>=0 y>=0} ,且x,y为整数,则3x+4y的最小值是? 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 若实数x,y满足不等式y 已知实数x,y满足不等式组：2x-y=0,x+2y 若实数x,y满足不等式组x>=0 ,y>=0,x+2y 设实数x,y满足不等式组3y-x≥0,y+2x+a≥0,y-2x-2≤0,若x²+y²的最小值为5,则a的取值为? 以知实数x,y满足不等式组y 已知实数x,y满足不等式组y 设实数x,y满足不等式组x+y≤1,y-x≤1,y≥0, 则x/(y+1)的取值范围...? 高二数学题-不等式的证明设实数x,y满足y+x^2=0,0 若·z=x+2y,且实数x,y满足不等式组2x-5y-4=0,x+y-2 设实数x,y满足不等式组 ①x-y-1大于等于0②2x-y-6小于等于0③x+y+6大于等于0.求x方+y方的最小值 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 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