题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064619-36805.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064619-93047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064619-24904.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064619-13094.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064620-24126.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064620-15567.png)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064620-24026.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064620-39268.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064619-93047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064620-32406.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064621-92623.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064621-41298.png)
解析
试题分析:(Ⅰ)由
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064619-13094.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064621-75525.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064620-15567.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064621-82800.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064621-92623.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064621-94234.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064621-94234.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064621-94234.png)
试题解析:(I)由题意得
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064622-88617.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064622-62463.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064622-27739.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064622-73131.png)
①-②得
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064622-89276.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064623-90643.png)
经验证
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064623-20481.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064621-92623.png)
(II) 由(1)得
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064623-41540.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064623-42853.png)
两式相减得
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064624-76947.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064624-25717.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064621-41298.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064605-89448.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064605-21882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064605-58530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064606-50562.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064606-86675.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064606-85475.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064549-29666.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064549-84155.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064549-51140.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064550-13344.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064549-84155.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064550-71046.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064550-72588.png)
⑴证明:数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064549-29666.png)
⑵若
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064550-63965.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064551-60609.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064551-94646.png)
⑶若
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064551-80478.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064551-54377.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064540-13123.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064540-43860.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064540-17303.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064540-97129.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064541-81293.png)
A.![]() | B.![]() | C.![]() ![]() | D.![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064532-82256.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064532-75142.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064532-83746.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064532-40227.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064520-39398.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014064520-63316.png)
A.15 | B.12 | C.9 | D.6 |
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