题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192027-66301.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192027-60624.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192027-88109.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192027-58598.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192027-95484.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192027-88109.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192028-24463.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192027-88109.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192028-37193.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192027-88109.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192028-56611.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192028-37389.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192027-88109.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192028-24463.gif)
⑵
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192027-88109.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192028-56611.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192029-83113.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192029-47763.gif)
∵抛物线的准线是
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192029-28204.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192029-97967.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192030-59281.gif)
∴上述条件等价于
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192030-90920.gif)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192030-34932.gif)
∴上述条件等价于
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192028-37389.gif)
即当且仅当
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192028-37389.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192027-88109.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192028-24463.gif)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192027-88109.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192028-56611.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192030-91881.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192027-88109.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192030-84907.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192030-81085.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192031-17001.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192031-47938.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192031-95774.gif)
得
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192031-34719.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192030-81085.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192031-61214.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192031-71520.gif)
设
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192027-58598.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192031-19603.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192032-16306.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192032-18678.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192032-28713.gif)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192032-87226.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192032-61538.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192032-85015.gif)
即得
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192027-88109.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192028-56611.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025192029-83113.gif)
核心考点
试题【设两点在抛物线上,是的垂直平分线,(1)当且仅当取何值时,直线经过抛物线的焦点?证明你的结论;(2)当直线的斜率为时,求在轴上的截距的取值范围。】;主要考察你对抛物线的定义与方程等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025191919-32691.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025191919-74110.gif)
(1)当点C运动时,|MN|是否变化?写出并证明你的结论?
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025191846-59706.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025191846-20053.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025191838-65717.gif)
已知抛物线以原点为顶点,以
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025191807-11881.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025191807-92760.gif)
(1)求抛物线的方程;(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025191808-32569.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025191808-58399.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025191808-94051.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025191808-29427.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025191809-22986.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025191808-32569.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025191743-19592.gif)
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