题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124458-48045.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124459-96807.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124459-46376.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124459-79755.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124459-26481.png)
(Ⅰ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124500-61367.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124500-14931.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124458-48045.png)
(Ⅱ)数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124458-48045.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124459-79755.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124500-29604.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124501-41916.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124501-70088.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124501-41916.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124501-77356.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124501-38272.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124501-77356.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124502-90067.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124502-11493.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124459-96807.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124503-31217.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124458-48045.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124503-91623.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124459-46376.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124503-20688.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124503-20770.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124504-85300.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124504-30610.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124504-16416.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124458-48045.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124504-82019.png)
(Ⅱ)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124505-47655.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124505-97383.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124505-63603.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124505-14266.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124506-87317.png)
解析
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124450-89517.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124450-16580.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124450-16806.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124450-72396.png)
(1)求证:数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124451-98015.png)
(2)设数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124450-89517.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124451-94563.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124451-19549.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124450-16806.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124452-77217.png)
(Ⅰ) 求此四数;
(Ⅱ)若前三数为等差数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124441-68284.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124442-99071.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124442-80954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124442-63722.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124442-62515.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124442-86444.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124424-38917.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124424-27709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124424-16145.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124424-83725.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124425-90676.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124425-56925.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124425-29547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124425-55701.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124426-88275.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124426-63155.png)
A.39 | B.20 | C.19.5 | D.33 |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124417-36651.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124417-29041.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124417-63338.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124418-19851.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124418-20929.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124418-62323.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124408-86378.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124408-74763.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124408-54178.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124409-49002.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124409-20690.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124409-45508.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124408-74763.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124408-74763.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124409-15481.png)
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