若x−2y+1≥02x−y−1≤0
设变量x,y满足约束条件x−y≥0x+y≤1x+2y≥1
若实数x,y满足x≥1x+y≤4x−2y+c≤0
若x−2y+1≥02x−y−1≤0
若实数x,y满足y≥1y≤2x−1x+y≤m.
若实数x,y满足x−y+1≥0x+y≥0x≤0
若实数x,y满足不等式组x+3y−3≥02x−y−3≤0x−my+1≥0
若实数x,y满足条件0≤x≤10≤y≤22y−x≥1
设变量x、y满足x+y≥1x−y≥02x−y−2≤0,则目标函数z=2x+y的最小值为( )
(2012•唐山二模)设变量x、y满足x+y≥1x−y≥02x−y−2≤0,则目标函数z=2x+y的最小值为( )
若x,y满足约束条件x−y+1≥0x+y−3≤0x+3y−3≥0
若变量x,y满足约束条件x≥−1y≥xx+y≤1
设x,y满足约束条件x+y≤1y≤xy≥−2