题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010144457-11336.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010144457-68853.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010144457-96746.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010144457-50624.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010144458-84515.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010144458-29548.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010144457-96746.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010144458-79652.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010144458-42899.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010144459-78586.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010144459-98275.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010144459-31072.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010144457-96746.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010144458-79652.png)
A.1 | B.2 | C.3 | D.4 |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010144459-88361.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010144500-51014.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010144500-59929.png)
核心考点
试题【数列的各项均为正数,为其前项和,对于任意,总有 成等差数列.设数列的前项和为,且,则对任意实数(是常数,)和任意正整数,小于的最小正整数为 ( )A.】;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/20191010/20191010144208-11103.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010144208-51793.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010144208-11103.png)
(II)若数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010144208-95115.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010144209-66998.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010144209-38521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010144209-99620.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010144209-26630.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010144210-47279.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010143721-32241.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010143721-25985.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010143721-93396.png)
1)写出数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010143722-13727.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010143722-85577.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010143721-93396.png)
2)求经过多少年后,该项目的资金可以达到或超过
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010143722-23990.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010143646-10356.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010143646-62908.png)
1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010143646-35174.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010143647-97121.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010143647-59697.png)
3)设
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010143647-85007.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010143647-16542.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010143648-96502.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010143635-18684.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010143636-79372.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010143636-80462.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010143636-13871.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010143636-26320.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010143636-25139.png)
已知数列{an}满足Sn+an=2n+1,
(1) 写出a1, a2, a3,并推测an的表达式;
(2) 用数学归纳法证明所得的结论。
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