过抛物线
的焦点
作直线
交抛物线
于
.若
,则直线
的斜率是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bb4dd4670828f75bc573b52cdd02e1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b8115446a8cb1b1d28c49b7d2606974.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
更新时间:2017-04-08 18:09:04
|
【知识点】 根据韦达定理求参数
相似题推荐
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适中
(0.65)
【推荐1】过点
的直线l与抛物线
交于A,B两点,F为抛物线的焦点,若
.则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b33e0c12611a356e7cd3affe547b0ea.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd243fab0af865af67a2ab817e909cf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ac62b1ade07205ae2693ec1ab135def.png)
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填空题-单空题
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适中
(0.65)
解题方法
【推荐2】已知不经过坐标原点O的直线l与抛物线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0782718dd8b2e591ef21fc89d1af2fb.png)
交于A,B两点,以AB为直径的圆经过点O,若当直线l变化时,点
到直线l的最大距离为
,则E的准线方程为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0782718dd8b2e591ef21fc89d1af2fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75de1947893e5c7a4d98d4458398fd6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0f8ae1c18b12cac28c9c4aad354962d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/619096595112f0340a43b756e114dd3d.png)
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