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:2,3,5,9,17,()。 A.27 B.30C.33D.35
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5, 3, 7, 9, 15, 23, ()。A.27B.31C.35D.37
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3, 5, 7, 9, 13, 15, 21, 23, ()。A.29 B.31 C.33 D.35
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3,5,9.17,()。 A.25 B.29 C.33 D.41
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2,3,5,9,17,33,() A.65 B.35 C.39 D.41
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3,5,9,13,21,25,()A.27B.29C.31 D.33
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1/3,2/5,4/9,(),16/23,32/33A.6/13B.8/15C.10/17D.12/19