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3, 9, 27, 81,()A.243 B.342 C.433 D.135
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1, 3, 3, 9, (), 243。 A.81 B.9 C.12D.27
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1,3,3,9,27,()A.251 B.243 C.223 D.143
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3,-3,9,-3,27,-3,(),-3 A.81 B.243 C.729 D.54
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从1,3,9,27,81,243这六个数中,每次取出若干个数(每次取数,每个数只能取一次)求和,可以
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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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0,1/9,2/27,1/27,()。A.27B.7/9C.5/18D.4/243