Re: [問題] 數學一題 我竟然把我學過的數學全忘了
※ 引述《p00o99o ()》之銘言:
: 365×297+366×103除以9之餘數為?
: sol:R9(5×0+6×4)=R9(24)=6
: ↑↑↑↑↑
: 為什麼要這樣?
: 糟糕 我把原本的都忘光光了
: 正在想辦法回覆記憶中
我的解法
(365×297+366×103)
=
(366 x 297 + 366 x 103 - 297)
=
(366x400 - 297)
看成
366x400/9 - 297/9
(把剩下的餘數留下來)
=>
6x4/9-0
=
24/9
餘數=>6
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