问题标题:
【象这样的`````````````````````````````1```````````````````````````````123``````````````````````````````12345`````````````````````````````1234567```第10行倒数地6个是什么?第15行倒数四20个是什么?知道的来!要说出理由和】
问题描述:
象这样的
`````````````````````````````1```
````````````````````````````123```
```````````````````````````12345```
``````````````````````````1234567```
第10行倒数地6个是什么?
第15行倒数四20个是什么?
知道的来!
要说出理由和规律
侯滨回答:
n行就是2n-1个数
10行就是1----19,所以倒数第6个就是14
15行就是1----29,倒数第20个就是10
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