问题
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1,3,3,5,7,9,13,15(),() A:19,21;B:19,23;C:21
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:1,2/3,5/9,1/2,7/15,4/9,()。A.5/9 B.3/5 C.2/13D.3/7
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:1, 3, 3, 5, 7, 9, 13, 15, (), ()。A.19,21B.19,23C.2l,23D.27,30
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1, 3, 3, 5, 7, 9, 13, 15, (), ()。A.19,21B.19,23C.2l,23D.27,30
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1,2/3,5/9,1/2,7/15,4/9,()。 A.5/9B.3/5C.2/13 D.3/7
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1 3 3 5 7 9 13 15 ( ) ( )。A.19 21 B.19 23 C.21 23