题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023325-56036.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023325-92404.gif)
(1)写出
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023326-48010.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023325-56036.gif)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023326-44802.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023326-24278.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023326-26449.jpg)
解:(1)∵
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023325-92404.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023327-69128.gif)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023327-85581.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023327-24223.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023327-49986.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023327-23030.gif)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023327-84442.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023328-79916.gif)
∴数列
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023325-56036.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023328-20135.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023328-61191.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023328-90175.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023329-75019.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023329-12795.gif)
令
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023329-58173.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023329-33124.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023329-12829.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023330-38809.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023330-63535.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023330-79905.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023330-62720.gif)
即当
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023327-84442.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023331-51509.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023331-75496.gif)
另解:
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023331-95768.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023331-68582.gif)
∴ 数列
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023325-56036.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023331-66033.gif)
解析
核心考点
举一反三
A.40 | B.53 | C.63 | D.76 |
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023052-78989.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023052-46930.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023053-83116.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023053-61589.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023053-19566.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023053-14559.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023053-61589.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023054-17872.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023053-19566.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023053-14559.png)
A.5 | B.10 | C.15 | D.20 |
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023029-47294.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023030-45283.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023030-24196.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023030-77642.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023030-89285.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023030-20685.png)
A.![]() | B.![]() |
C.![]() | D.![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023020-96156.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023021-65888.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011023021-20610.png)
A.40 | B.42 | C.43 | D.45 |
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