题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110048-14035.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110048-98146.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110049-16171.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110049-20194.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110049-68409.png)
(1) 求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110048-14035.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110049-16171.png)
(3) 记
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110049-96090.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110050-58330.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110050-24316.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110050-45403.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110050-66351.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110051-43845.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110051-93273.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110051-31796.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110049-68409.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110051-29512.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110052-59565.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110052-39916.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110052-77604.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110100-67774.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110049-16171.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110100-90511.png)
解:(Ⅰ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110048-14035.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110100-62308.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110100-50305.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110101-38184.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110051-43845.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110051-93273.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110051-31796.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110101-76092.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110050-45403.png)
(Ⅱ)当
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110051-29512.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110052-59565.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110101-10677.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110101-76505.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110052-39916.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110101-54191.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110102-40328.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110052-77604.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110100-67774.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110102-61454.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110049-16171.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110102-70155.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110103-87122.png)
(Ⅲ)由(2)可知:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110103-43895.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110103-74190.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110103-85269.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110104-50067.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110104-84385.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110104-53678.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110104-46157.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110050-66351.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110012-68525.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110012-93658.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110012-33317.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110012-27623.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110013-47794.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110013-87192.png)
(2)记
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110013-60885.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110013-46107.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110012-93658.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012105926-84181.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012105926-82825.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012105926-47881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012105926-95590.png)
A.68 | B.72 | C.54 | D.90 |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012105913-77367.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012105914-72189.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012105914-23760.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012105907-60212.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012105907-47490.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012105907-22799.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012105907-60212.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012105908-71533.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012105907-22799.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012105908-71533.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012105837-51335.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012105837-18407.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012105837-36929.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012105837-30674.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012105837-51335.png)
(2)令
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012105838-64977.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012105838-47458.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012105837-18407.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012105838-70008.png)
(3)若不等式
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012105838-44725.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012105838-81326.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012105839-35231.png)
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