幾何問題??????(延邊教育出版社,,,,,,一課三練 .....初一數學下.97)

2007-09-22 6:13 am
一條直線把平面分為二part,,,,,,如三條直線怎樣把平面分為八part.....六條直線怎樣把平面分為二十二part???.....十條直線怎樣把平面分為五十六part????


thanks for your help!!!!!!!!
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please put the picture in your ansew!!!!!!!!


jasmine

回答 (1)

2007-09-23 8:35 pm
✔ 最佳答案
1條直線把平面分為 2 份,2 = 1 + 1
2條直線把平面分為 4 份,4 = 1 + 3 = 1 + 1 + 2
3條直線把平面分為 7 份,7 = 1 + 6 = 1 + 1 + 2 + 3
4條直線把平面分為 11 份,11 = 1 + 10 = 1 + 1 + 2 + 3 + 4
5條直線把平面分為 16 份,16 = 1 + 15 = 1 + 1 + 2 + 3 + 4 + 5
6條直線把平面分為 22 份,22 = 1 + 21 = 1 + 1 + 2 + 3 + 4 + 5 + 6
7條直線把平面分為 29 份,29 = 1 + 21 = 1 + 1 + 2 + 3 + 4 + 5 + 6 + 7
8條直線把平面分為 37 份,37 = 1 + 21 = 1 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8
9條直線把平面分為 46 份,46 = 1 + 21 = 1 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9
10條直線把平面分為 56 份,56 = 1 + 21 = 1 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10

注意:所有直線的交點都不重疊。

圖片參考:http://i225.photobucket.com/albums/dd64/catandcat2007/2007-09-23-01c.jpg


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