問題詳情
10. 設有兩等差級數，若第 n 項的比為(4n－2)：(3n＋1)，則它們前 19 項之和的比為多少？
參考答案
答案：A
難度：簡單0.79941
統計：A(271),B(33),C(17),D(0),E(0)
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