已知变量x，y满足条件x+y≤6x−y≤2x≥0y≥0

设变量x，y满足约束条件x−y≥0x+y≤1x+2y≥1 若变量x，y满足约束条件x+y≤2x≥1y≥0 设z=2x+y，变量x，y满足条件x−4y≤−33x+5y≤25x≥1 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 已知变量x，y满足约束条件x≥0y≥x3x+4y−12≤0 已知变量x y 满足约束条件x-y+1≥0 x-2≤0 y+2≥0,则目标函数z=x+y的最大值. 已知实数x，y满足条件2x+y≥3x+y−3≤0x≥0y≥0 设变量x,y满足约束条件 {x-y≥0,x+y≤1,x+2y≥0},则函数Z=2x+y 的最大值? 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. 已知变量x，y满足约束条件x+2y-3≤0x+3y-3≥0y-1≤0 设变量xy满足约束条件x-y≥0,x+y-2≥0,3x-y-6≤0则目标函数z=2x-y 变量x,y满足x-2y=0,x