题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040609-83896.png)
A.一条直线 | B.两条直线 | C.一个圆 | D.以上答案都不对 |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040609-22077.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040610-40301.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040610-43084.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040603-52617.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040603-11521.gif)
A、B两点,O是坐标原点,且三点A、B、O构成三角形.
(1)求k的取值范围;
(2)三角形ABO的面积为S,试将S表示成k的函数,并求出它的定义域;
(3)求S的最大值,并求取得最大值时k的值.
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040604-21687.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040558-96048.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040558-78792.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040550-23884.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040550-79912.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040550-23884.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040550-21360.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040550-70588.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040550-72642.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040551-99959.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040539-31106.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040539-24246.gif)
(Ⅰ)求证:直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040539-31106.gif)
(Ⅱ)当圆M截
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040539-31106.gif)
如图,
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040531-57953.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040531-92553.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040531-38861.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040532-71581.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040531-92553.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040532-79308.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040532-18199.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040532-42660.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040532-69325.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040532-49343.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040532-71581.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040532-97769.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040532-72876.gif)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040532-67107.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040531-92553.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040533-89194.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023040533-30656.gif)
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