問題詳情
5.若等差數列第n項an＝－5n＋42，則此等差數列的公差為何？
(A) 5
(B) －5
(C) 42
(D) －42
(A) 5
(B) －5
(C) 42
(D) －42
參考答案
無參考答案
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