设x,y满足条件1≤x−y≤3−1≤x+y≤1
设x,y满足条件1≤x−y≤3−1≤x+y≤1
设z=2x+y,变量x,y满足条件x−4y≤−33x+5y≤25x≥1
设变量x,y满足约束条件x+y≤3x−y≥−1y≥1
设变量x,y满足约束条件x−y≥0x+y≤1x+2y≥1
设x,y满足约束条件x+y≤1y≤xy≥−2
若实数x,y满足条件0≤x≤10≤y≤22y−x≥1
设实数x,y满足条件x≥0x≤yx+2y≤3
设变量x y满足约束条件x-y≥-1 x+y≥1 2x-y≤1 z=(x-2y)/(x+y)的最大值
已知实数x,y满足条件x≥0,y≥x,3x+4y≤12,则(x+2y+3)/(x +1)的最大值是
设变量x,y满足约束条件2x−y≤2x−y≥−1x+y≥1
已知实数x,y满足条件{2x-y+1≥0,2x+y≥0,x≤1,求z=x+3y的最小值.
设实数x,y满足不等式组y+x≤1y-x≤1y≥0