2/3,1/3,5/12,2/15,53/480,()   A.3/7   B.75/2568   C.428/25440   D.652/27380

2/3,1/3,5/12,2/15,53/480,()

  A.3/7

  B.75/2568

  C.428/25440

  D.652/27380

参考答案:C

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