题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093648-53952.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093648-22383.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093649-41895.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093649-59471.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093648-53952.png)
(2)若函数
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093649-14637.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093649-39457.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093650-79663.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093650-67835.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093648-22383.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093649-59471.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093650-77887.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093651-27470.png)
(2)由(1)可知
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093651-18180.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093651-44687.png)
因为函数
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093650-67835.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093651-95792.png)
因为当
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093649-39457.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093650-67835.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093652-88528.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093652-25251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093652-62774.png)
所以函数
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093650-67835.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093652-66667.png)
解析
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093638-59130.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093638-76651.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093639-92946.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093639-78985.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093639-28032.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093639-16382.png)
A.![]() | B.![]() | C.25 | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093632-40128.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093632-95921.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093632-94422.png)
A.14 | B.16 | C.18 | D.20 |
已知递增等比数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093618-44461.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093618-23314.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093619-59695.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093619-37639.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093619-96299.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093619-43971.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093619-96299.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093619-93212.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093620-55554.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093620-62135.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093620-23843.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093620-21355.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093611-82821.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093611-75995.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093612-92242.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093605-43875.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093605-60088.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093605-67850.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014093605-42640.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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