观察下列数据,按某种规律在横线上填上适当的数:
1,﹣
,
,﹣
,____ ,____ ,____ …
1,﹣
![](https://img.xkw.com/dksih/QBM/2016/12/27/1633715925934080/1633715926179840/STEM/a52d6135f3d24e359a343bb68cc03740.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2016/12/27/1633715925934080/1633715926179840/STEM/2edba8a039614ee7997393de7793f6f2.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2016/12/27/1633715925934080/1633715926179840/STEM/dbe564cd8c854e8eb4d341a3541bdce0.png?resizew=21)
更新时间:2017-02-28 14:26:28
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【推荐1】下面每个正方形中的五个数之间都有相同的规律,根据这种规律,则第
个正方形的中间数字为____________ .(用含
的代数式表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/cb44c582-f6f3-4811-a6d2-b8044174c557.png?resizew=522)
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【推荐2】观察下列单项式:
按此规律,可以得到第2020个单项式是__________ ;第
个单项式是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ea6dd7238af5ba55512524d33cc240a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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