题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171453-67597.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171453-13594.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171453-59876.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171453-40794.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171453-67597.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171454-48781.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171454-97207.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171453-13594.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171454-21817.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171454-39821.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171455-48451.png)
解析
试题分析:本题主要考查由
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171453-59876.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171455-94868.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171455-29002.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171455-94868.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171455-57068.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171453-67597.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171455-94868.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171456-33762.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171456-62275.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171456-69102.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171456-52914.png)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171457-20181.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171457-40235.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171457-46566.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171458-59381.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171458-18639.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171458-82785.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171458-24236.png)
所以数列
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171453-67597.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171459-12591.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171459-12591.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171454-39821.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171459-99399.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171459-84317.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171459-62883.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171500-15709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171500-18707.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171453-59876.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007171455-94868.png)
核心考点
试题【已知数列的前项和为,且.(1)求数列的通项公式;(2)设,求数列的前项和.】;主要考察你对数列的概念与表示方法等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000724-74564.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000725-21303.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000726-12205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000726-96014.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000726-80918.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000727-85238.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000727-44604.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000726-80918.png)
①集合
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000727-36525.png)
②若
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000727-71648.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000727-18546.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000727-35696.png)
③若
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000727-75534.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000727-18546.png)
④若
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000727-30639.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000726-80918.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000728-27709.png)
其中正确的结论是 .(填上你认为所有正确的结论序号).
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000732-10290.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000732-53758.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000732-67881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000732-60870.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000732-50848.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000732-67881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000734-46203.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000734-49228.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000735-97398.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000737-77075.png)
①
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000737-32389.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000737-86932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000737-46098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000737-52063.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190815/20190815000738-47940.png)
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