题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002426-35245.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002426-55613.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002426-21527.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002427-72408.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002427-53761.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002427-70553.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002428-28893.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002428-76071.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002428-82644.png)
解析
试题分析:(I)由题设得:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002429-55891.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002429-29561.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002429-28543.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002428-76071.png)
(II)由
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002428-76071.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002429-83060.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002429-92255.png)
①当
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002430-65760.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002430-27587.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002430-91613.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002430-26563.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002431-69753.png)
试题解析:(I)设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002429-28543.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002437-92742.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002437-60747.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002437-79001.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002429-55891.png)
解得
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002429-29561.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002429-28543.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002428-76071.png)
(II)由
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002428-76071.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002429-83060.png)
①当
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002430-65760.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002438-74410.png)
=
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002438-63188.png)
② 当
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002430-27587.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002430-91613.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002430-26563.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002431-69753.png)
所以数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002438-46137.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002438-70519.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002408-79329.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002408-98415.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002409-91623.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002409-55179.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002409-75884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002409-91922.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002408-98415.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002409-68215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002410-20208.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002410-14381.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002410-29154.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002408-79329.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002409-91922.png)
(Ⅱ)满足
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002410-26646.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002411-23406.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002411-45095.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002359-21579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002359-89384.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002359-59174.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002400-72631.png)
A.0 | B.7 | C.14 | D.21 |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002348-11616.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002349-87248.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002349-61837.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002349-20616.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002349-70803.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002350-38615.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002350-98165.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002348-11616.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002349-70803.png)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002350-45553.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002351-53016.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002351-78501.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002351-83564.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002338-33999.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002338-30099.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002339-32224.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002338-33999.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002339-59239.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002339-10752.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002320-58696.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002321-26294.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002321-42004.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012002321-83254.png)
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