题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072639-36863.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072640-33287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072640-77760.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072640-29104.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072640-79367.png)
(1)证明:数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072641-91102.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072641-61405.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072641-29082.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072641-30660.png)
(3)记
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072641-35585.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072642-75405.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072642-58636.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072642-46001.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072642-99806.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072643-80115.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072643-45685.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072643-40807.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072643-25232.png)
(3)1
解析
试题分析:(1)证明:由已知
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072643-77933.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072644-35067.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072644-91459.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072644-78701.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072644-37444.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072642-99806.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072644-65325.png)
(2)解:由(1)知
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072645-80003.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072645-78180.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072643-80115.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072643-45685.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072645-91489.png)
=
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072643-25232.png)
(3)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072645-52623.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072645-30086.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072646-73782.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072646-59101.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072646-56949.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072646-97069.png)
点评:主要是考查了数列的概念以及数列求和的综合运用,属于中档题
核心考点
试题【已知=2,点()在函数的图像上,其中=.(1)证明:数列}是等比数列;(2)设,求及数列{}的通项公式;(3)记,求数列{}的前n项和,并求的值. 】;主要考察你对等比数列等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072635-16744.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072635-80772.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072635-31505.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072635-78871.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072625-89648.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072625-53554.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072626-45276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072626-52888.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072626-30894.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072623-56197.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072623-38225.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072623-56197.png)
A.充分而不必要条件 | B.必要而不充分条件 |
C.充分必要条件 | D.既不充分也不必要条件 |
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072607-88717.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072607-12726.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072607-72139.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072608-21005.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072608-67495.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072608-16723.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072608-69517.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072556-38375.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072557-33317.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072557-34072.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072557-47267.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072557-78545.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072558-63714.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072558-27398.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072558-15601.png)
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