94年第二次基測數學第4題詳解 - 臺劇
By Isabella
at 2017-07-19T19:47
at 2017-07-19T19:47
Table of Contents
4. 某書店的文具價格為:鉛筆一支7元,原子筆一支15元、橡皮擦一個20元。若有5位小
朋友,每人各買一件文具,共花了64元,則其中有幾人買原子筆?
(A) 4 (B) 3 (C) 2 (D) 1
解:
原子筆的錢及橡皮擦的錢皆為5的倍數,無論買多少個總金額的個位數一定是0或5,不可
能是4;鉛筆要買2支,總金額的個位數才會有4;因此,鉛筆要買2支、原子筆買2支及橡
皮擦買1支,共五支,且總金額=14+30+20=64。故選(C)。
※ [本文轉錄自 SYSOP 看板 #1PRPVytF ]
作者: wens (文思) 看板: SYSOP
標題: [公告] 8/5 停機公告
時間: Tue Jul 18 13:09:14 2017
配合 8/5 高壓電設備年度檢驗
PTT, PTT 網頁板於 07:30 至 17:30 暫停服務
PTT2 於 05:00 例行系統維護開始至 17:30 暫停服務
PTT 於隔日 05:00 仍會進行短暫之例行系統維護
造成不便, 敬請見諒
--
朋友,每人各買一件文具,共花了64元,則其中有幾人買原子筆?
(A) 4 (B) 3 (C) 2 (D) 1
解:
原子筆的錢及橡皮擦的錢皆為5的倍數,無論買多少個總金額的個位數一定是0或5,不可
能是4;鉛筆要買2支,總金額的個位數才會有4;因此,鉛筆要買2支、原子筆買2支及橡
皮擦買1支,共五支,且總金額=14+30+20=64。故選(C)。
※ [本文轉錄自 SYSOP 看板 #1PRPVytF ]
作者: wens (文思) 看板: SYSOP
標題: [公告] 8/5 停機公告
時間: Tue Jul 18 13:09:14 2017
配合 8/5 高壓電設備年度檢驗
PTT, PTT 網頁板於 07:30 至 17:30 暫停服務
PTT2 於 05:00 例行系統維護開始至 17:30 暫停服務
PTT 於隔日 05:00 仍會進行短暫之例行系統維護
造成不便, 敬請見諒
--
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