题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235527-90861.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235527-22906.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235527-75225.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235528-92107.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235528-10416.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235528-73671.gif)
(2)试比较
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235528-73741.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235529-78999.gif)
(3)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235529-72015.gif)
答案
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235529-58918.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235529-85576.gif)
(3)略
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235530-11673.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235530-29909.gif)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235530-25739.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235530-34052.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235531-87180.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235529-58918.gif)
(2)∵
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235531-14138.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235531-51149.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235531-57399.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235529-85576.gif)
(3)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235531-82783.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235532-70478.gif)
而
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235532-21895.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235532-36922.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235532-97114.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235532-70478.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235532-90095.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235533-50671.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235533-23153.gif)
……
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235533-28470.gif)
相加得
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235533-58504.gif)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235534-76278.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235534-13092.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235535-49366.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235535-89184.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235535-78318.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235535-41474.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235511-91975.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235511-54582.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235512-91156.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235512-20716.gif)
项公式为
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235512-56530.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235502-45594.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235502-83896.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235503-13442.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235503-38389.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235503-80713.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235503-12761.gif)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235503-40390.gif)
(2)设四边形
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235504-10021.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235504-22741.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235504-40651.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235446-38795.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235446-54063.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235446-77053.gif)
A.15 | B.30 | C.31 | D.64 |
数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235423-45033.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235423-92444.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235424-12862.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235424-47910.gif)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235423-45033.gif)
(Ⅱ)等差数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235424-52252.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235423-92444.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235424-46863.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235425-85964.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235425-75047.gif)
等比数列.
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235424-52252.gif)
(2)求证:当
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235425-48172.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235425-57211.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235418-30780.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235419-77588.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012235418-30780.gif)
A.8 | B.16 | C.32 | D.36 |
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