题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161447-28604.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161447-97890.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161447-22174.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161448-42987.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161448-87308.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161447-22174.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161448-82250.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161447-22174.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161448-60561.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161447-22174.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161449-18068.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161449-80240.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161447-22174.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161448-82250.gif)
⑵
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161447-22174.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161449-18068.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161449-78979.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161449-49243.gif)
∵抛物线的准线是
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161449-65503.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161450-37213.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161450-19191.gif)
∴上述条件等价于
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161450-92511.gif)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161450-88987.gif)
∴上述条件等价于
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161449-80240.gif)
即当且仅当
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161449-80240.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161447-22174.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161448-82250.gif)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161447-22174.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161449-18068.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161450-88844.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161447-22174.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161451-58747.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161451-29759.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161451-37135.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161451-27595.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161452-31605.gif)
得
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161452-28676.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161451-29759.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161452-31779.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161452-67463.gif)
设
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161448-42987.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161452-56328.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161453-90318.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161453-12419.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161453-47628.gif)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161453-78337.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161454-66059.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161454-66233.gif)
即得
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161447-22174.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161449-18068.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161449-78979.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/20191025/20191025161442-21769.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161442-70638.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161442-77042.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161442-42601.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161442-29960.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161442-79252.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161443-52234.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161442-42601.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161443-37092.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161443-80887.gif)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161431-12357.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161431-12743.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161431-36381.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161431-44290.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161431-36381.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161431-62013.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161431-44010.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161431-36381.gif)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161412-15012.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161412-85714.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161413-90604.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161413-51801.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161413-26698.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161413-53831.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161413-39471.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161414-48230.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161414-91384.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161414-22703.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161350-98149.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161350-67273.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161345-28876.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025161345-58226.gif)
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