Forgot password?
 Create new account
View 2258|Reply 11

这样的题不分年龄段的吧 算是益智类吧 据说都是小学题

[Copy link]

801

Threads

4888

Posts

310K

Credits

Credits
36170

Show all posts

isee Posted at 2013-8-22 20:21:40 |Read mode
Last edited by isee at 2013-8-23 15:43:001.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。

snap.png

700

Threads

110K

Posts

910K

Credits

Credits
94172
QQ

Show all posts

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

801

Threads

4888

Posts

310K

Credits

Credits
36170

Show all posts

 Author| isee Posted at 2013-8-22 20:34:56
看来这些也是经典啊

700

Threads

110K

Posts

910K

Credits

Credits
94172
QQ

Show all posts

kuing Posted at 2013-8-22 20:35:00
QQ截图20130822203414.png

7

Threads

128

Posts

879

Credits

Credits
879

Show all posts

第一章 Posted at 2013-8-23 11:04:34
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……

34

Threads

98

Posts

929

Credits

Credits
929

Show all posts

hongxian Posted at 2013-8-23 12:11:38
回复 1# isee


    00.png

801

Threads

4888

Posts

310K

Credits

Credits
36170

Show all posts

 Author| isee Posted at 2013-8-23 14:25:18
Last edited by isee at 2013-8-23 15:42:002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

700

Threads

110K

Posts

910K

Credits

Credits
94172
QQ

Show all posts

kuing Posted at 2013-8-23 14:48:10
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。

700

Threads

110K

Posts

910K

Credits

Credits
94172
QQ

Show all posts

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

34

Threads

98

Posts

929

Credits

Credits
929

Show all posts

hongxian Posted at 2013-8-23 15:08:31
回复 7# isee

看了K的解答,1是不是也要加上每排三棵?

801

Threads

4888

Posts

310K

Credits

Credits
36170

Show all posts

 Author| isee Posted at 2013-8-23 15:41:32
回复 10# hongxian

加上加上,这样好些

87

Threads

2383

Posts

110K

Credits

Credits
13325

Show all posts

其妙 Posted at 2013-8-23 22:55:56
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

手机版Mobile version|Leisure Math Forum

2025-4-21 14:24 GMT+8

Powered by Discuz!

× Quick Reply To Top Return to the list