问题
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2/5,3/7,4/10,6/14,8/20,12/28,()A.224/56B.14/32C.20/48D.16/40
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2/5,3/7,4/10,6/14,8/20,12/28,() A.224/56B.14/32C.20/48D.16/40
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2/5, 3/7, 4/10, 6/14, 8/20, 12/28, () A.224/56 B.14/32 C.20/48 D.16/40
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1,2,3,6,12,()。 A.18B.16C.24D.20
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2, 8, 4, 6, 3, ()。A.18 B.16 C.14 D.12
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2,-6.8,-4,-8,()A.12B.16C.20 D.24