题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011928-49583.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011929-39669.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011929-79499.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011929-42565.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011929-42565.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011929-61839.jpg)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011930-37860.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011930-70870.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011930-44888.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011930-22275.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011930-44888.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011930-11259.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011929-39669.gif)
得
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011931-97502.gif)
∴等腰梯形
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011929-42565.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011931-11436.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011931-18902.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011931-99377.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011932-43024.gif)
得
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011932-64807.gif)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011932-60662.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011932-31766.gif)
又当
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011932-65408.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011933-88859.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011933-67749.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011933-55017.gif)
∴在区间
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011933-44709.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011933-36640.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011932-31766.gif)
∴当
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011932-31766.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011933-36640.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011934-10204.gif)
即当
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011932-31766.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011934-60375.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011934-11012.gif)
因此只需分别作
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011930-37860.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011930-70870.gif)
(12分)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011924-24830.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011925-64109.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011925-39894.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011925-84377.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011925-64109.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011925-86773.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011926-20505.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011926-63136.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011920-77962.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011920-27532.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011915-91390.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011915-41892.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011915-34283.gif)
A.![]() | B.![]() | C.![]() | D.![]() ![]() |
如图,过原点且倾斜角为
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011908-44503.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011908-16234.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011908-97473.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011909-72017.gif)
(I)求
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011909-96602.gif)
(II)求
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011909-84789.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011909-22965.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011859-61894.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011859-83128.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011859-96936.gif)
(Ⅰ)求曲线C的方程;
(Ⅱ)求点P的坐标;
(Ⅲ)以曲线C的中心为圆心,AB为直径作圆O,过点P的直线l截圆O的弦MN长为
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023011859-27765.gif)
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