设xy满足约束条件

已知xy满足约束条件y 设xy满足约束条件x>=0 y>=0 4x+3y=0 设x，y满足约束条件x+y≤1y≤xy≥−2 设X,Y满足约束条件X+Y 设xy满足约束条件 x+y>=1 x-2y>=-2 3x-2y 设实数xy满足线性约束条件x+y≤3 x-y≥1 y≥0 已知变量xy满足约束条件x+2y-3 已知xy满足约束条件y=2 2X+y 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 设xy满足约束条件x≥0,x≥y,2x-y≤1,求z=3x+2y的最大值 设X,Y满足约束条件{X-4Y xy满足约束条件x-ay-1>=0,2x+y>=0,x