单项选择题

A.Change his mind．
B.Go swimming with others．
C.Finish his book report．
D.Answer his letters．

A.Change
B.
B.Go
C.
C.Finish
D.
D.Answer
E.

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【简答题】对于标准线性规划问题：
min{cx|Ax=b,x≥0)，
假设A为对称方阵，且c^T=b．试证明：若x⁽⁰⁾为它的可行解，则x⁽⁰⁾也是它的最优解．

答案：这时对偶问题可写为
max cy，s．t．Ay≤b．x⁽⁰⁾是原问题的可行解，取y=x

单项选择题

A.The woman will go for a ride around the town tomorrow．
B.The woman has lent her car to her sister for tomorrow use。
C.The man will drive his mother around town tomorrow．
D.The man will go shopping in the supermarket tomorrow．

A.The
B.
B.The
C.The
D.
D.The
E.