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:2,3,5,7,11,()。 A.12 B.13 C.14 D.15
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1,2,3/2,8/5,5/3,12/7,() A.10/7 B.11/7 C.14/8 D.13/8
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1,2,3/2,8/5,5/3,12/7,() A.10/7 B.11/7 C.14/8 D.13/8
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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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2,3,5,7,11,()。 A.12B.13C.14D.15
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1,1,2,3,5,7,(),()。A.14,17B.13,15C.12,15D.14,16
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1,1,2,3,5,7,(),()。A.14,17B.13,15C.12,15D.14,16