题目
题型:不详难度:来源:
答案
解析
所以am=2,则S2m-1=
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053427-10018.png)
核心考点
举一反三
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A.2 | B.2或![]() | C.4 | D.4或![]() |
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