问题
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1/6,1/6,1/12,1/24,() A.1/48;B.1/28;C.1/40;D.1/2
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1/6,1/6,1/12,1/24,() A.1/48;B.1/28;C.1/40;D.1/2
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:1/3,1/4,1/6,1/12,1/36,()。 A.1/72 B.1/144 C.1/216 D.1/432
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:-1,1,27,125,() A.152 B.363C.432D.343
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1/3,1/4,1/6,1/12,1/36,()。 A.1/72 B.1/144 C.1/216 D.1/432
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-1,1,27,125,() A.152 B.363C.432D.343