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标题: 每周一题 by 万精油: 圆环问题 [打印本页]

作者: fzy 时间: 2005-2-25 20:44
标题: 每周一题 by 万精油: 圆环问题

圆环问题

Difficulty: ++

能否把三个圆环套在一起使得任意取掉一个其它两个也自然脱离？

If I remembered correctly, the problem appeared here before. So let's try a general version: Can you do it for N rings? (Assume the rings are as flexible as needed.)

作者: QL 时间: 2005-2-26 05:13
标题: 回复：每周一题 by 万精油: 圆环问题

第二圆上均匀取A，B，C，D四点，沿直径AB对折行成‘夹子’，夹第一圆的一段圆弧。第三圆靠近C，D两‘夹头’穿过即可。

N个圈时，只要‘夹子’夹‘夹子’，最后一圈穿过倒数第二圈的‘夹头’即可。

不知说清楚没有。www.ddhw.com

作者: fzy 时间: 2005-2-26 20:17
标题: Rubber Band method

That is exactly what I have in mind. When little girls play with rubber bands, they string up the rubber bands this way. I thought a girl would come up with a solution first, because there are more smart girls here than any other places I know. :) They probably ignored this post. :(

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