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因為電子鐘每到整點響鈴,所以我們只要考慮哪個整點亮燈就行了.從中午12點起,每9分鐘亮一次燈,要過多少個9分鐘才到整點呢由於1小時=60分鐘,這個問題換句話說就是:9分鐘的多少倍是6O分鐘的整數倍呢這樣一來問題的實…
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