题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004430-35848.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004430-20103.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004430-65592.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004430-97704.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004431-89315.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004431-91197.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004431-91197.gif)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004431-20275.gif)
(3)数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004431-53585.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004432-33499.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004430-65592.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004432-16562.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004432-37922.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004432-97732.gif)
求和
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004432-19714.gif)
答案
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004433-49409.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004433-57518.gif)
(3)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004433-80164.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004433-49409.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004432-37922.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004433-26184.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004434-24785.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004433-57518.gif)
(3)依题意,
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004432-37922.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004434-21315.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004434-32842.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004434-36776.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004435-57180.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004435-15528.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004435-23353.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004435-57917.gif)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004435-33128.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004436-14075.gif)
①-② 得
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004436-14788.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004436-30815.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004436-63478.gif)
核心考点
试题【((本小题满分12分)已知偶函数经过点(1,1),为数列的前n项和,点 ()在曲线上.(1)求的解析式(2)求的通项公式(3)数列的第n项是数列的第项(),且.】;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/20191013/20191013004411-67264.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004411-69730.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004411-67264.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004411-14741.gif)
A.![]() | B.![]() | C.![]() | D.![]() |
A.f(x)=2x+1 | B.f(x)=4x2 |
C.f(x)=log3x | D.f(x)=()x |
已知等差数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004355-71577.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004356-94327.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004356-82716.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004356-24243.gif)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004355-71577.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004356-37048.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004356-94327.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004356-82716.gif)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004357-52005.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004357-39883.gif)
设数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004339-49191.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004339-47583.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004339-86849.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004340-70903.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004340-95803.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004340-25626.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004340-49473.gif)
(1)求证:数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004339-49191.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004340-85648.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004341-43691.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004339-47583.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004341-19751.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004341-83230.gif)
(3)设数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004339-49191.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004341-45640.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004341-88776.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004342-68077.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004342-89434.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004327-45562.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004327-13871.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004328-60314.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004328-44836.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004328-70865.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013004328-42553.gif)
A.-512 | B.1024 | C.-1024 | D.512 |
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