問題詳情
9. 已知 a、b 均為正整數，且 a2 ＋92 ＝( 20b＋1 )2 ：，請問下列『正確』的有哪些？ 甲說：可證明出 a2 為 10 的倍數 乙說：可證明出 a2 為 8 的倍數 丙說：可證明出 a2 為 9 的倍數 丁說：可證明出 a2 為 20b＋1 的倍數
(A)丁
(B) 甲、乙、丙
(C) 甲、丙、丁
(D) 甲、乙
(A)丁
(B) 甲、乙、丙
(C) 甲、丙、丁
(D) 甲、乙
參考答案
答案：D
難度：計算中-1
書單：沒有書單，新增
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