题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063134-72159.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063134-38921.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063134-59705.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063134-72159.png)
(2)若数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063134-72159.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063134-13585.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063140-40577.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063134-13585.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063140-62323.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063141-40758.png)
解析
(1)设等差数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063134-72159.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063141-16778.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063141-66454.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063141-51052.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063142-71787.png)
(2)因为
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063142-84891.png)
解:(1)设等差数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063134-72159.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063141-16778.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063141-66454.png)
由题设,
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063141-51052.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063142-71787.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063140-62323.png)
(2)因为
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063142-84891.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063142-58592.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063141-40758.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063142-91271.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063143-64145.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063141-40758.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063113-73791.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063113-39190.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063114-27196.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063114-13880.png)
且
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063114-29325.png)
(1)求r的值; (4分)
(2)当b=2时,记
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063114-92535.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063114-68971.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063114-44079.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063114-71019.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063114-65818.png)
A.24 951 |
B.24 950 |
C.25 051 |
D.25 050 |
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010062754-46446.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010062754-52501.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010062754-86007.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010062754-15028.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010062754-46446.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010062755-61197.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010062755-23268.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010062755-24374.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010062633-21522.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010062633-87514.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010062633-69701.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010062633-34768.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010062633-33071.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010062634-47462.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010062620-21955.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010062620-11462.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010062621-17943.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010062621-49158.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010062621-38531.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010062621-29949.png)
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