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用单纯形法验证下列线性规划问题目标函数无界:
   max  z=6x1+2x2+10x3+8x4,
   s.t.3x1-3x2+2x3+8x4≤25,
   5x1+6x2-4x3-4x4≤20,
   4x1-2x2+x3+3x4≤10,
   x1,x2,x3,x4≥0.

A.t.3x1-3x2+2x3+8x4≤25,
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    听力原文: Cambodian Prime Minister Hun Sen Friday accused the U-N leadership of trying to dictate the terms of a Khmer Rouge tribunal. In scathing language, the outspoken Cambodian leader said his government would hold Khmer Rouge trials on its own if necessary, and bluntly told the United Nations to stay out of Cambodian affairs.
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    (四) 一个由4个部件组成的串联系统,4个部件的故障率分别是:λ1=000 2/h λ2=0.000 8/h λ3==.000 4/h λ4=0.000 6/h假设系统的故障发生服从指数分布。 86.系统的故障率λs为( )。.
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