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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77, 49, 28, 16, 12, 2, ()。A.10 B.20C.36 D.45
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77,49,28,16,12,2,()A.10B.20C.36 D.45
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77 49 28 16 l2 2 ()A.10B.20C.36D.45
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77,49,28,16,12,2,()。 A.10 B.20 C.36 D.45