問題詳情
8.若 a 為奇數，b 為偶數，則下列哪一個式子所代表的數一定是奇數？
(A) 7ab
(B) 2a＋3b
(C) a2＋9b2
(D)（3a＋5）2
(A) 7ab
(B) 2a＋3b
(C) a2＋9b2
(D)（3a＋5）2
參考答案
答案：C
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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