已知数列
的前4项为1,0,1,2,写出数列
的一个通项公式,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
更新时间:2023-02-04 22:59:03
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【推荐1】已知等差数列
的各项均为正数,记
为
的前n项和,若数列
是等差数列,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06cc825531264608318c1488d6a3d8df.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/832d1e3a06f59a35396aac6e12c5e2ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06cc825531264608318c1488d6a3d8df.png)
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【推荐2】在平面直角坐标系中,已知三个点列
,其中
满足向量
与向量
共线,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
_________ .(用
表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68cfbf2824d77b586d816a925c465c8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be4c6983fa18ab94b38dda19857dd5be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2305da40edad2359391a7000c5a783c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51e636a7be3ab49f81ae44bfd9d4963a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27ef0ea97a5a81ef4601b924b6276617.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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【推荐1】提丢斯—波得定则是关于太阳系中行星轨道的一个简单的几何学规则,它是1766年由德国的一位中学老师戴维·提丢斯发现的,后来被柏林天文台的台长波得归纳成一条定律,即数列
:0.4,0.7,1,1.6,2.8,5.2,10,19.6,…表示的是太阳系第n颗行星与太阳的平均距离(以天文单位A.U.为单位).现将数列
的各项乘以10后再减4得数列
,可以发现
从第3项起,每一项是前一项的2倍,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/414187fca31df508dbf88d7f2bb83662.png)
______ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2f03f58e3c85de45bd3fd86a8a66f7.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/414187fca31df508dbf88d7f2bb83662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2f03f58e3c85de45bd3fd86a8a66f7.png)
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