問題詳情
22. 關於 ∑ 的運算，下列選項何者正確？
(A)
(B)
(C)
(D)
(A)
(B)
(C)
(D)
參考答案
答案：C
難度：適中0.540541
統計：A(8),B(8),C(20),D(1),E(0)
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