问题
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:4,2/3,20/27,7/16,36/125,() A.39/144B.11/54C.68/169D.7
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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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4, 3/2, 20/27, 7/16, 36/125, () A.39/144 B.11/54 C.68/196 D.7
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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.15/38 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