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已知点 http://picflow.koolearn.com/upload/papers/20140823/20140823162755962562.gif,设 http://picflow.koolearn.com/upload/papers/20140823/20140823162755977397.gif是区域 http://picflow.koolearn.com/upload/papers/20140823/201408231627559931221.gif边界上的点,则下列式子恒成立的是(   )

发布时间:2021-07-16

A.http://picflow.koolearn.com/upload/papers/20140823/20140823162756009544.gif

B.http://picflow.koolearn.com/upload/papers/20140823/20140823162756024547.gif

C.http://picflow.koolearn.com/upload/papers/20140823/20140823162756133540.gif

D.http://picflow.koolearn.com/upload/papers/20140823/20140823162756149526.gif

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