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这样的题不分年龄段的吧 算是益智类吧 据说都是小学题

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isee posted 2013-8-22 20:21 |Read mode
Last edited by hbghlyj 2025-5-6 02:171.将9棵树排成10排,第排3棵,怎么排?




2.将下图分成相同的四个全等的部分。

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kuing posted 2013-8-22 20:30
以前在人教群答过 10 棵树种成 12 排的,翻翻记录先

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original poster isee posted 2013-8-22 20:34
看来这些也是经典啊

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kuing posted 2013-8-22 20:35
Last edited by hbghlyj 2025-5-6 02:22

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第一章 posted 2013-8-23 11:04
第2个问题,大小相等?是指形状一样?还是面积而已?
如果是后者,就简单……

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hongxian posted 2013-8-23 12:11
回复 1# isee


    00.png

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original poster isee posted 2013-8-23 14:25
Last edited by isee 2013-8-23 15:422表达不清,补充一下,需全等。


2完美解决了

==============

1.将9棵树排成10排,第排3棵,怎么排?

还未解决

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kuing posted 2013-8-23 14:48
回复 7# isee

将我4#的图的最上面那棵去掉(此举减少了三排),再将下面底边上那棵移到中间与上面中间的两棵共线(这样就扳回了一排),即可。

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kuing posted 2013-8-23 14:53
中间的三棵总是共线是依据 pappus 定理。

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hongxian posted 2013-8-23 15:08
回复 7# isee

看了K的解答,1是不是也要加上每排三棵?

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original poster isee posted 2013-8-23 15:41
回复 10# hongxian

加上加上,这样好些

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其妙 posted 2013-8-23 22:55
以前看过,那个叫吴胜奎的《数海拾贝》里有大量的这类题,可惜没有该书,更没有pdf版的,早忘了

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