(1)已知直线
经过抛物线
的焦点F,且与抛物线相交于A、B两点.若直线
的倾斜角为
,求
的值;
(2)抛物线
截直线
所得弦长等于?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0261104a7c308433a0c0508ff20ea29a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b40ecaf1c1ce4dc9e33c8dc8731f2123.png)
(2)抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3577bf250e9110428ff34f518fbd9f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cd749e80e671faa681d3c40d032df26.png)
更新时间:2020-12-28 09:12:15
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【知识点】 求直线与抛物线相交所得弦的弦长
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【推荐1】已知抛物线
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)的焦点F,E上一点
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(1)求抛物线E的方程;
(2)过F作直线l交抛物线E于A,B两点,若直线AB中点的纵坐标为
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(1)求抛物线E的方程;
(2)过F作直线l交抛物线E于A,B两点,若直线AB中点的纵坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
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适中
(0.65)
【推荐2】已知抛物线
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求
![](https://img.xkw.com/dksih/QBM/2012/3/21/1570813212008448/1570813217341440/STEM/05f18b064abe454d872eb5dac5cc0a96.png)
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