問題詳情
24.已知 
，其中 a 是正整數、0 < b < 1 。問 
，其中 a 是正整數、0 < b < 1 。問
參考答案
答案：D
難度：適中0.453125
統計：A(4),B(34),C(32),D(58),E(0)
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