问题
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1,1,5,3,9,9,13,27,(),() A.17,81 B.
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1/3,3/9,2/3,13/21,() A.17/27;B.17/26;C.19/27;D.
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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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1,4/3,13/9,40/27,()。A.121/81 B.67/81 C.121/51 D.67/51
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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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39,13,13/3,13/9,()。 A.2/3 B.13/27 C.27/13 D.1/2