问题
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:7 7 9 17 43 () A.119B.117C.123D.121
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2,11/3 ,28/5 ,53/7 ,86/9,()A.12 B.13 C. 123/11 D. 127/11
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2,11/3 ,28/5 ,53/7 ,86/9,() A.12 B.13 C. 123/11 D. 127/11
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7,9,32,123,620,()A.3720B.3715C.3705D.3680
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9,32,123,620,() A.3720 B.3715 C.3705 D.3680
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[(9,6)42(7,7)][(7,3)40(6,4)][(8,2)()(3,2)] A.30 B.32 C.34 D.36