※ 引述《miriamhsiao (小美)》之铭言： : You are invited to the Cat Kingdom for the coronation. : They offered the King 8 identical-looking crowns to choose from. : Seven of them weigh the same, and the only one weighs slightly less. : The King wants the light one. : You have to help him to find out the light one. But you can only use : balance scales in ONLY TWO weighings. What do you do then? 一边各放三个王冠秤第一次 如果两边等重 表示较轻的在剩下两个里面 这两个再秤第二次即可 如果两边不等重 一边高一边低 表示较轻的王冠在较高的那一边归为a组(有3顶) 换句话说 较低的那边3个王冠和没秤到的2个王冠都一样重 接着从a组里任取两顶去秤第二次 如过一样重表示剩的一顶就是较轻的 如果不一样重则较轻的那顶就是答案 --

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