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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1/4,2/7,2/5,8/13,1() A.9/16 B.3 C.32/19 D.28/17
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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.224/56B.14/32C.20/48D.16/40
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-2,4,-8,-4,32,28,()A.-464 B.896C.664 D.148