题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015043012-68876.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015043012-65461.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015043013-39939.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015043013-90898.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015043013-61530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015043013-63643.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015043014-29561.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
试题分析:因为
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015043013-39939.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015043013-90898.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015043015-89702.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015043012-68876.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015043015-18623.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015043015-32519.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015043015-18740.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015043016-60267.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015043016-97907.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015043013-61530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015043013-63643.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015043016-20909.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015043013-63643.png)
点评:对于此类问题,学生应该掌握求通项公式的几种方法和求数列前
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015043013-63643.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015043006-36313.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015043006-27075.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015043007-71720.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015043007-32879.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015043001-40107.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015043001-74857.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042956-62969.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042956-47328.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042956-62969.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042956-71233.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042956-20975.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042956-71233.png)
A.6 | B.7 | C.8 | D.9 |
已知点
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042944-56370.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042944-26561.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042944-38000.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042944-11723.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042944-97352.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042945-61365.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042945-43921.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042945-69212.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042945-53415.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042946-21322.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042946-95771.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042946-30652.png)
(Ⅰ)证明:数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042946-21350.png)
(Ⅱ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042946-38109.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042945-69212.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042947-67648.png)
已知数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042936-11016.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042936-36380.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042936-49111.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042936-11016.png)
(Ⅱ)设数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042936-11016.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042936-59907.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042936-32539.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042936-15953.png)
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