观察下列各式:当
时,
,当
时,
,当
时,
,根据以上规律,写出当
时的等式是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be604061cf1591f7069472269d4c9719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82be4b5a8356eb586cccbbb0b10e51c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fac3649308b528fd56545ba102dc42d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b193db7d7b6f351f568d70e2179bf7ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45cf86650443d1b86c79b1e3edc7e5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee78b9fda8a1fd4f73284af0646c7195.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294250dbd576bff3da0a1456cb9a88a5.png)
更新时间:2023-07-16 20:56:52
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【推荐1】按下列规律排列的一列数对(-1,2)、(3,-5)、(-6,8)、(10,-11)、……,第n个数对是_______ .
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【推荐2】让我们轻松一下,做一个数字游戏.第一步:取一个自然数
,计算
得
;第二步:算出
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,计算
得
;第三步:算出
的各位数字之和得
,计算
得
;……依次类推:则
=_________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a40f3453b0ebbf943d22a0734e2950.png)
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