已知实数满足条件，x≥0y≥1x−y+1≥0

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满足条件{2x-y+1≥0,2x+y≥0,x≤1,求z=x+3y的最小值. 若实数x，y满足条件0≤x≤10≤y≤22y−x≥1 已知实数x，y满足条件2x+y≥3x+y−3≤0x≥0y≥0 已知实数x，y满足y≤1y≥|x−1| 设实数x，y满足条件x≥0x≤yx+2y≤3 已知实数x,y满足以下三个条件：1、x-y+2≤0；2、x≥1；3、x+y-7≤0,则y/x的最小值 （2012•浙江模拟）已知实数x，y满足约束条件2x−y≤0x−3y+5≥0y≥1 已知实数x，y满足x−y+5≥0x≤3x+y≥0 若实数x，y满足x−y+1≥0x+y≥0x≤0 已知实数x，y满足约束条件x−y≤12x+y≤4x≥1 若实数x，y满足x≥1x+y≤4x−2y+c≤0