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17,18,22,31,47,() A.54 B.63C.72 D.81
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0,7/3,22/5,45/7,76/9,()A.12 B.13 C. 106/11 D. 115/11
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1,1,5,3,9,9,13,27,(),()。A.17,81B.16,54 C.15,36D.14,42
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2,7,13,22,36,57,()。A.58 B.87 C.93 D.115
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6,13,22,35,54,81,()。A.115 B.117 C.118 D.116
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17,18,22,31,47,()。A.54B.63C.72D.81
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( ) 13.5 22 41 81。 A. 10. 25 B. 7. 25 C. 6.25