题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205534-12568.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205534-86374.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205534-60886.png)
若
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205535-89430.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205535-58991.png)
若
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205535-79934.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205535-88522.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205536-53507.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205535-89430.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205536-95476.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205535-88522.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205535-88522.png)
又因为
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205536-69030.png)
核心考点
试题【数列的前项和为,若,则= ;若 。】;主要考察你对数列的概念与表示方法等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205509-56652.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205510-94968.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205510-37537.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205510-74162.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205510-98792.png)
①数列{
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205509-56652.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205511-19439.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205511-30606.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205511-19628.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205510-74162.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205510-98792.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205510-74162.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205511-53622.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205431-58659.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205431-50574.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205432-35160.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205432-40489.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205432-93225.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205228-36083.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205229-77593.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205229-35245.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205229-49841.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205229-93308.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205229-34770.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205057-11243.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205058-61292.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205058-55625.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205058-63583.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205010-86330.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205011-90772.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205011-69290.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191007/20191007205011-21804.png)
A.100 | B.![]() | C.101 | D.![]() |
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