设x,y满足约束条件x+y>=a,x-y
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设x,y满足约束条件x+y>=a,x-y设x,y满足约束条件x+y>=a,x-y设x,y满足约束条件x+y>=a,x-y由x+y≥a,x－y≤－1得y≥(a+1)/2Z=x+ay≥a-y+ay=a+(
设x,y满足约束条件x+y>=a,x-y
设x,y满足约束条件x+y>=a,x-y
设x,y满足约束条件x+y>=a,x-y
由x+y≥a,x－y≤－1得
y≥(a+1)/2
Z=x+ay≥a-y+ay=a+(a-1)y,当a>1时,Z≥a+(a^2-1)/2,
后面求得a=3和-5,舍-5而得3
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