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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