问题
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1,3/4,9/5,7/16,25/9,()15/38 B.11/36 C.14/27 D.18/29
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1/51 4/53 9/56 16/60 ()A.18/61 B.20/63 C.25/65 D.27/69
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1,3/4,9/5,7/16,25/9,______ () A.15/38 B.11/36 C.14/27 D.18/29
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1/51 4/53 9/56 16/60 () A.18/61 B.20/63 C.25/65 D.27/69
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1,3/4,9/5,7/16,25/9,() A.15/38 B.11/36 C.14/27 D.18/29
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1,3/4,9/5,7/16,25/9,()A.15/38B.11/36C.14/27D.18/29