题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085045-42087.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085046-48214.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085046-18239.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085046-77372.png)
(2)是否存在
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085046-50214.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085046-40468.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085046-77372.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085047-68133.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085047-96341.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085047-73918.png)
(2)存在三组
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085047-89627.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085048-72501.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085048-78140.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085048-93497.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085048-24652.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085049-54016.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085049-20527.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085049-97255.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085049-31509.png)
解析
(2)本小题难度偏大,应从特值出发探索,做此类问题应有较强的计算能力,逻辑分析能力,和扎实的数学基本功,还要有坚强的意志.
解:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085051-95004.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085051-18415.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085047-96341.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085047-73918.png)
(2)因为存在
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085051-79292.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085052-26163.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085052-86576.png)
①若
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085052-49291.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085052-60801.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085052-92336.png)
故存在
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085052-89278.png)
②若
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085053-23130.png)
③若
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085053-81988.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085053-55567.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085053-45645.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085054-24076.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085054-93781.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085054-53884.png)
④若
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085054-91448.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085055-43996.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085055-84353.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085055-59581.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085055-40337.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085055-58272.png)
故存在三组
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085047-89627.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085048-72501.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085048-78140.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085048-93497.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085048-24652.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085049-54016.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085049-20527.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085049-97255.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085049-31509.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085036-68055.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085037-13212.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085037-47650.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085027-34732.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085028-67579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085028-52898.png)
A.16(![]() | B.16(![]() |
C.![]() ![]() | D.![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085012-36963.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085013-23149.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085013-89164.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085013-66398.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085013-22881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085014-49188.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085014-14635.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085014-83092.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085014-86701.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085014-90245.png)
(Ⅰ)求证:数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085015-24219.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085015-79270.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085018-62076.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014085018-13634.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014084953-71378.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014084954-52343.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014084954-75007.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014084954-87852.png)
A.![]() | B.![]() | C.![]() ![]() | D.![]() ![]() |
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