题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221324-12802.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221324-19628.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221324-98720.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221325-98533.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221325-97892.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221325-57011.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221325-33730.png)
(1) 求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221324-12802.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221325-98533.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221326-84851.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221326-29901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221325-97892.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221324-98720.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221326-98671.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221326-55615.png)
∴a3=5,a5=9,公差
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221326-66677.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221327-94005.png)
又当
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221325-97892.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221327-17483.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221327-22112.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221327-92164.png)
∴数列{
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221328-85324.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221328-32235.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221328-47076.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221328-28575.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221328-54918.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221326-29901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221325-97892.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221329-73315.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221329-84114.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221329-38261.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221329-89395.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221330-63980.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221330-89334.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221330-39735.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221330-48142.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221331-51037.png)
化简得:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221331-35123.png)
解析
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221259-46152.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221259-66804.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221259-78338.gif)
A.-6![]() | B.-3 | C.-1 | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221247-40656.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221247-34125.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221242-58004.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221242-68425.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221243-86076.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221243-96107.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221243-69810.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221243-11489.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221243-96107.gif)
A.16 | B.15 | C.14 | D.12 |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221205-64732.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221205-67676.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221206-30046.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221206-82150.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221206-65070.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221206-55498.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221206-11013.gif)
A.![]() | B.![]() | C.![]() | D.![]() |
已知数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221113-65922.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221114-31344.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221114-39362.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221114-49627.gif)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221116-52659.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221116-53071.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221116-94356.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221116-48830.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221117-75959.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221117-72384.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221117-14548.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221117-80806.gif)
(3)若
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221126-82832.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221126-28816.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221126-90918.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221126-47896.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012221127-58002.gif)
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