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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:2/3,4/9,6/27,() A.1/9B.8/81C.10/81D.12/81
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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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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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2,3,4,6,8,9,10,12,()。A.13B.14C.16D.18
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