题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234657-86771.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234657-58538.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234657-90332.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234658-25082.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234657-86771.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234658-50436.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234658-11864.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234658-25082.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234658-53198.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234658-76332.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234658-50436.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234659-33107.gif)
答案
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234659-31334.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234659-94418.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234659-33107.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234659-27603.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234657-90332.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234659-33264.gif)
解得
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234659-35735.gif)
设等差数列的公差为
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234700-98360.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234700-51058.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234700-12696.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234700-34035.gif)
故
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234700-86482.gif)
综上,
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234659-31334.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234659-94418.gif)
(2)∵
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234700-90130.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234701-11428.gif)
=(
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234701-14470.gif)
=
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234659-27603.gif)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234659-33107.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234659-27603.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234647-57230.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234647-81147.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234648-76006.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234648-77446.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234648-94112.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234648-41828.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234648-24375.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234648-94112.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234648-71138.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234649-43133.jpg)
(Ⅰ)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234648-71138.gif)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234649-46446.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234649-57854.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234648-77446.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234643-66456.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234643-34214.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234643-74308.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234643-66456.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234643-11018.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234644-51901.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234643-66456.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234622-73717.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234623-37085.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234623-52192.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234623-18475.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234623-69596.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234623-43985.gif)
(1)试求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234622-73717.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234622-73717.gif)
(2)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234624-55699.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234624-67316.gif)
(3) 求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234624-98545.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234617-25454.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234617-53317.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234617-91293.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234617-41186.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234618-56598.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234618-40621.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234618-96571.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234618-56598.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234618-56598.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234618-15260.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234552-83730.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012234552-56746.gif)
A.![]() | B.![]() | C.![]() | D.![]() |
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