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If n is a positive integer, what is the remainder when (74n + 3)(6n) is divided by 10 ?
分析A选项
分析B选项
分析C选项
分析D选项
分析E选项
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当前版本由 ya**** 更新于2015-12-25 10:03:20 感谢由 ya**** 对此题目的解答所做出的贡献。代入n=1, 得 7^7*6=49*49*49*7*6 得个位数为2*9=8 所以选E
带入N=1，得7^7*6,49*49*49*7*6 个位数为2*9=8 所以选 E
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