已知过抛物线
的焦点的直线交抛物线于A,B两点,若O为坐标原点,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eab25e4f4acfb0934bf0125577bbdc90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71ec1cf50cf51cffcc1038961399fa73.png)
A.![]() | B.![]() | C.0 | D.![]() |
更新时间:2020-03-16 12:29:30
|
相似题推荐
单选题
|
适中
(0.65)
解题方法
【推荐1】如图,正方形ABCD的顶点A,D分别在x轴正半轴、y轴正半轴上移动.若
,则a的最大值是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/69f2e274-ed21-4abe-84f5-2df6dd881dfb.png?resizew=201)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/131aa90abf2e5782496795c8384b5bf4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/69f2e274-ed21-4abe-84f5-2df6dd881dfb.png?resizew=201)
A.1 | B.![]() | C.2 | D.3 |
您最近一年使用:0次
单选题
|
适中
(0.65)
解题方法
【推荐2】设
是椭圆
上一点,
是其左,右顶点,
,则离心率![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47ce2b47812fce4b17fd813d0e4cce21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22962a2ad892cb6b14ab039a06e8cdc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a200ca2c4af794f4d1c6a5443830b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed3bc263d1eff3bc56e639a890c7e9bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47ce2b47812fce4b17fd813d0e4cce21.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
【推荐1】已知抛物线x2=﹣8y的焦点为F,点P为抛物线上的动点,点K(0,2),则
的最小值是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acdc4e898cfe063035c9d9c09e4b3cde.png)
A.2 | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
解题方法
【推荐2】已知抛物线
的焦点为
,
为抛物线
上异于顶点的一点,
的延长线交
轴于点
,若
为线段
的中点,则直线
的斜率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37ab7408ffcefcb8e5e1ad4a9c58f1b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1460aa3d83df61f6c411b34412135451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1460aa3d83df61f6c411b34412135451.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次