如图所示,过抛物线
的焦点
的直线
交抛物线于
,
两点,交其准线于点
,若
,且
,则
=_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3764ba3aa0a241787f4661026bb14053.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e58c044e7f97d195b09ada900fddc17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9be67c5efb824cadcaf0a993a55c932a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/91e7c340-b195-420d-8f1d-d0d04581e193.png?resizew=206)
更新时间:2022-02-26 18:03:25
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|
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名校
解题方法
【推荐1】已知抛物线
,
为坐标原点,直线
与抛物线
交于
两点,若
的重心为抛物线
的焦点
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb21c3251d6077513c31fdaee93b95be.png)
___________________ ;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6625416907564a6ec1b3099e685ec4a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82adc042dfb4dbfd1d8fcb5c6b3ecac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ae1567d8f98fabc1a3948f8602cc5e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c6492ac870d4fdeee5bc2f9af58abe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb21c3251d6077513c31fdaee93b95be.png)
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解题方法
【推荐2】如图所示,点F是抛物线
的焦点,点A,B分别在抛物线
及圆
的实线部分上运动,且
总是平行于x轴,则
的周长的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/363249d0034d4e586a3beb69b9e6aed3.png)
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![](https://img.xkw.com/dksih/QBM/2020/5/31/2474461593632768/2477230549557248/STEM/c8dff544da5448ce96339af2538dbc63.png?resizew=141)
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填空题-单空题
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适中
(0.65)
解题方法
【推荐1】已知抛物线
的焦点为
是抛物线上两点,若
8,则
的中点到
轴距离的最小值为_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0d0a522b36799e4bcc6e3645db4d4a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88bee8e70f1fab639be1636c7bce0477.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
您最近一年使用:0次
【推荐2】已知抛物线
的焦点为
,直线
过点
且与
交于
两点,且
,
与
的面积之比为
,其中
为坐标原点,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df5be1440d099f464ef46dee39de6010.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e6c830bfa9a1b979a1a9665166424bf.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df5be1440d099f464ef46dee39de6010.png)
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