抛物线
的焦点为
,过
且倾斜角为
的直线与抛物线交于
、
两点,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88bee8e70f1fab639be1636c7bce0477.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ad72d7565699d1ebb741eb0ce12bac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88bee8e70f1fab639be1636c7bce0477.png)
更新时间:2021-12-22 09:36:17
|
【知识点】 求直线与抛物线相交所得弦的弦长
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容易
(0.94)
【推荐1】椭圆
的两个焦点为
,过
的直线交椭圆于A,B两点.若
,则
的值为( )
A.10 B.12 C.16 D.18
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/547e5f876a14d8bded5ec2f7e657b911.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c348601813d70ba64ffca73cf2256f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbb85beefee158ba760a0ded42443a55.png)
A.10 B.12 C.16 D.18
您最近一年使用:0次
【推荐2】设过抛物线y2=4x的焦点F的直线交抛物线于A,B两点,且直线AB的倾斜角为
,则线段AB的长是____ ,焦点F到A,B两点的距离之积为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9955b5aebb73cd84447e8541f901ac.png)
您最近一年使用:0次