题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061111-10348.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061112-98787.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061111-10348.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061112-10196.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061112-94402.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061112-94402.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061112-75824.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061112-60282.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061113-72103.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061113-78587.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061113-77555.gif)
(3)若
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061113-39158.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061113-70240.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061114-53493.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061113-70240.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061114-15329.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061114-88335.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061114-17105.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061112-98787.gif)
过曲线①上点
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061112-10196.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061114-37175.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061115-55767.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061115-80871.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061115-96423.gif)
⑵ 过曲线①上点
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061115-32516.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061116-71198.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061116-18668.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061116-72300.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061116-39143.gif)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061116-90530.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061117-42693.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061117-49551.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061117-58881.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061117-42693.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061114-17105.gif)
(3)方法1 由(2)得
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061117-29311.gif)
故数列{x n-a}是以x 1-a=为首项,公比为-的等比数列,
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061118-21182.gif)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061113-39158.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061113-70240.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061118-24887.gif)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061113-70240.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061118-29660.gif)
方法2
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061118-19969.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061118-25083.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061119-24063.gif)
=
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061119-85794.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061118-25083.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061119-75365.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061119-86166.gif)
核心考点
试题【由原点向三次曲线引切线,切于不同于点的点,再由引此曲线的切线,切于不同于的点,如此继续地作下去,……,得到点列,试回答下列问题: ⑴求; (2)求与的关系式; 】;主要考察你对等差数列等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061049-82412.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061050-56489.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061050-87918.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061050-40901.gif)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061029-87982.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061029-65665.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061030-52750.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061030-94626.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061030-98337.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061030-15484.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061015-83521.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061016-19927.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061016-48691.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061016-21048.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061016-70536.gif)
⑵公差不为零的等差数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061016-19927.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061016-85416.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061017-20167.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061016-19927.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061016-48691.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061015-83521.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061003-55148.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061003-91766.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061003-75975.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061003-84999.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061003-91766.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013061004-38371.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013060956-43329.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013060956-86425.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013060956-69602.gif)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013060956-43329.gif)
(2)数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013060956-43329.gif)
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