题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230345-29293.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230346-75971.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230346-92901.gif)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230346-23761.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230346-91100.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230347-13592.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230347-73900.gif)
答案
(1)证明略
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230347-89078.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230347-27580.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230347-48485.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230348-76887.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230348-74035.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230348-88350.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230348-93285.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230349-70824.gif)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230349-10625.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230349-75961.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230349-29102.gif)
∴数列{
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230350-91294.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230350-43631.gif)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230346-75971.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230350-68361.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230350-71779.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230347-27580.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230351-64958.gif)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230347-73900.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230351-58075.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230351-98326.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230347-89078.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230319-84588.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230319-18532.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230319-88309.gif)
(1)计算
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230320-90797.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230320-99189.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230320-18529.gif)
(2)由(1)推测
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230320-40634.gif)
(3)证明(2)中你的结论.
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230305-39314.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230306-80581.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230306-60061.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230306-82810.png)
A.15 | B.30 | C.31 | D.64 |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230247-12378.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230248-80198.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230248-97231.png)
A.14 | B.15 | C.16 | D.17 |
已知数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230238-29506.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230238-59775.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230239-34136.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230239-30032.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230238-29506.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230239-17880.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230239-49362.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230239-30032.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230239-22940.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230240-16022.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230239-17880.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230240-68801.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230222-63871.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230222-76410.gif)
(I)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230222-63871.gif)
(II)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012230222-53640.gif)
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