两杆大烟枪 电影在线看:六年级数学题
来源:百度文库 编辑:高校问答 时间:2024/10/03 15:21:11
长方形ABCD的对角线相交于O点(如下图)。有一只小蚂蚁由A点出发,要沿着长方形的边或对角线爬到C点,中间不许爬回A点,也不许重复爬过的路,问一共有多少条爬行路线?(下面的长方形打不出来,看得出是长方形就行了)
A D
O
B C
A``````````````````````````D
`````````````````````````O
```````````````B``````````````````````````C
(这是图形,中间的点别管,那是用占位子抵消系统空格的)
A D
O
B C
A``````````````````````````D
`````````````````````````O
```````````````B``````````````````````````C
(这是图形,中间的点别管,那是用占位子抵消系统空格的)
7
1:A->c
2:A->D->c
3:A->B->c
4:A->B->O->C
5:A->D->O->C
6:A->O->B->C
7:A->O->D->C