一.如果一部电影需要90分钟播完,那么这部电影在它开始15分钟后播放了电影的几分之几?
二.在一个被分成N排N个小块正方形的正方形游戏板上面,其中有K个这些正方形小块排列在游戏板的四周边缘.
选E.先在纸上画一个正方形,然后将其分成N行N列,这样就得到了很多小正方形,稍微观察一下你就会发现四周的小正方形数目是有规律的,即K=4N-4.将上面答案带进去算,发现只有52才符合.N=14,K=52.
英语翻译一 If a film takes 90 minutes to show,what fraction of th
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