問題詳情
3. 下列哪些選項是正確的？( 其中a為整數)
(A) a5-a必為5的倍數
(B) a9-a必為9的倍數
(C) 奇數的平方除以8必餘1
(D)123456789不是平方數
(E)x2+y2+z2+u2+v2=252有全為奇數的解
(A) a5-a必為5的倍數
(B) a9-a必為9的倍數
(C) 奇數的平方除以8必餘1
(D)123456789不是平方數
(E)x2+y2+z2+u2+v2=252有全為奇數的解
參考答案
答案：A,C,D
難度：非常困難0
統計：A(0),B(0),C(0),D(0),E(0)
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