已知实数x，y满足x−y+2≥0x+y≥0x≤1.

已知实数x，y满足x−y+5≥0x≤3x+y≥0 已知实数x，y满足2x+y−2≥0x−2y+4≥03x−y−3≤0则x 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 已知实数x，y满足2x+y−2≥0x−2y+4≥03x−y−3≤0 已知实数x，y满足条件2x+y≥3x+y−3≤0x≥0y≥0 （2012•安徽模拟）已知实数x，y满足x−2y+2≥0y≥|x| 若实数x，y满足x≥1x+y≤4x−2y+c≤0 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. 已知实数x、y满足2x−y≤0x+y−5≥0y−4≤0 （2012•浙江模拟）已知实数x，y满足约束条件2x−y≤0x−3y+5≥0y≥1 若实数x、y，满足x≥0y≥04x+3y≤12 已知实数x,y满足不等式组Y≤X,X+Y≤2,Y≥0,那么目标函数Z=+3Y的最大值是?