题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012254-32050.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012254-80783.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012255-66247.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012255-40039.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012255-99761.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012255-78125.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012255-99760.png)
(Ⅰ)求证:数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012306-10574.png)
(Ⅱ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012255-78125.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012306-89334.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012306-43027.png)
(Ⅲ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012307-25709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012306-89334.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012307-51729.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012307-99891.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012307-52686.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012308-64274.png)
解析
试题分析:(Ⅰ) 本小题首先数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012254-32050.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012254-80783.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012255-66247.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012254-32050.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012318-66025.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012306-10574.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012318-63144.png)
(Ⅱ) 本小题首先求得数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012255-78125.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012318-92705.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012306-89334.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012307-99891.png)
(Ⅲ)本小题首先分析
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012307-25709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012306-89334.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012319-51045.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012255-78125.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012319-83179.png)
试题解析:(Ⅰ)由已知可得,
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012319-63541.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012319-43900.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012319-65689.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012319-86236.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012320-64568.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012320-26553.png)
(Ⅱ)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012320-96991.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012320-81542.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012320-20795.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012321-63280.png)
-②得
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012321-72332.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012321-42846.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012321-44063.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012322-38580.png)
(Ⅲ)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012322-72885.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012322-43825.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012322-16705.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012322-72645.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012323-44399.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012323-96040.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012323-15673.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012323-60108.png)
若
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012307-25709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012324-47769.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012324-15565.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012324-12794.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012307-52686.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012308-64274.png)
核心考点
试题【已知数列是首项为,公比的等比数列.设,,数列满足;(Ⅰ)求证:数列成等差数列;(Ⅱ)求数列的前项和;(Ⅲ)若对一切正整数恒成立,求实数的取值范围.】;主要考察你对等差数列等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012247-86496.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012247-80167.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012248-65803.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012248-43063.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012227-62039.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012227-59564.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012227-40080.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012227-47936.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012228-32939.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012228-87529.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012228-27329.png)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012239-72882.png)
(3)求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012227-62039.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012239-24743.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012239-84553.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012158-69994.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012158-17433.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012158-41674.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012159-72522.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012159-61577.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012159-18912.png)
⑴求证:数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012159-91871.png)
⑵若数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012159-90869.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012200-64715.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012159-90869.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012158-17433.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012200-29135.png)
⑶设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012200-98280.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012200-89893.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012148-10008.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012148-28570.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012149-74256.png)
A.1 | B.![]() | C.2 | D.-2 |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012123-53258.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012123-20527.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012123-34317.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012012123-53258.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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