题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135228-18457.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135229-52415.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135230-25540.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135230-16020.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135230-75227.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135230-54765.png)
(2)记
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135230-85424.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135231-76564.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135229-52415.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135231-40596.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135231-56663.png)
解析
第一问中,利用
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135230-25540.png)
第二问中,由于第一问中确定了
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135230-54765.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135231-81529.png)
然后分段考虑求和问题。
解:(Ⅰ)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135231-20095.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135232-23615.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135232-55276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135232-50946.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135232-94631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135233-86213.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135233-87899.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135233-38807.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135233-40844.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135232-50946.png)
(Ⅱ)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135234-24910.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135231-81529.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135231-76564.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135229-52415.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135234-66421.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135234-46306.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135234-15034.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135235-32260.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135235-19994.png)
故:数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135231-76564.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135229-52415.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135231-56663.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135129-19358.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135129-48599.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135130-91446.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135129-19358.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135130-49141.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135130-91446.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135130-49141.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135108-15684.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135109-58756.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135109-13703.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135114-11268.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135108-15684.png)
(2)令
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135114-76187.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135115-69073.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135109-58756.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135115-63303.png)
(3)若不等式
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135115-33440.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135116-14348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010135116-81747.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010134755-12739.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010134755-84575.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010134755-23311.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010134755-82527.png)
A.58 | B.88 | C.143 | D.176 |
已知等差数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010134115-17415.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010134116-68826.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010134116-98789.png)
(Ⅰ)求等差数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010134115-17415.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010134116-71251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010134116-51879.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010134116-70780.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010134116-96897.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010134117-34626.png)
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