問題詳情
1. 等差數列中，a1為首項，有 n 項且總和為n S ，下列四個選項，何者錯誤？
(A)
(B)
(C)
(D)
(A)
(B)
(C)
(D)
參考答案
答案：B
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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