问题
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2/3,1/2,3/7,7/18,() A、4/11;B、5/12;C、7/15;D、3/16
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2/3,1/2,3/7,7/18,() A.5/9;B.4/11;C.3/13;D.2/5
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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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1,3/4,9/5,7/16,25/9,______ () A.15/38 B.11/36 C.14/27 D.18/29
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2/3 ,1/2 ,5/9 ,(),11/15 A.2/5 B.6/11 C.3/4 D.7/12
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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