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如果n是正偶数,则C http://picflow.koolearn.com/upload/papers/20140823/20140823133114651200.gif+C http://picflow.koolearn.com/upload/papers/20140823/20140823133114667195.gif+…+C http://picflow.koolearn.com/upload/papers/20140823/20140823133114698217.gif+C http://picflow.koolearn.com/upload/papers/20140823/20140823133114698196.gif=(  )

发布时间:2021-07-12

A.2http://picflow.koolearn.com/upload/papers/20140823/20140823133114729178.gif

B.2http://picflow.koolearn.com/upload/papers/20140823/20140823133114745194.gif

C.2http://picflow.koolearn.com/upload/papers/20140823/20140823133114760197.gif

D.(n-1)2http://picflow.koolearn.com/upload/papers/20140823/20140823133114745194.gif

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