已知数列5,6,1,-5,…,该数列的特点是从第二项起,每一项都等于它的前后两项之和,则这个数列的前16项之和S16等于________ .
2018高三·全国·专题练习 查看更多[3]
更新时间:2018-02-07 11:00:08
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【知识点】 数列求和的其他方法
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【推荐1】对于函数
,部分
与
的对应关系如下表:
数列
满足
,且对任意
,点
都在函数
的图象上,则
的值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![]() | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
![]() | 3 | 7 | 5 | 9 | 6 | 1 | 8 | 2 | 4 |
数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e976c0663fa749ca749f99842d21ca03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87a60302649eb940748da818199e55da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed97a2706595b8053e24a461664a4524.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b8a78b9b2030cf3ca42da4535341f9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f8aaeeb9d2231f72bf22530f23904b7.png)
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【推荐2】已知数列
的通项公式
,其前n项和为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e472ad6e7bf7a6a409a43d4ea9035e0.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c06dd07bcdcf34c4cbeb9a07462407e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e472ad6e7bf7a6a409a43d4ea9035e0.png)
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