经过抛物线C:
的焦点F的直线l与抛物线交于不同的两点A,B,若
(其中O为坐标原点),则直线l的斜率为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db27d9350f65da1325e980c8e2e5f51a.png)
21-22高二下·四川成都·期末 查看更多[2]
四川省成都市蓉城名校联盟2021-2022学年高二下学期期末联考文科数学试题(已下线)第21讲 抛物线的焦点弦中点弦问题-【同步题型讲义】2022-2023学年高二数学同步教学题型讲义(人教A版2019选择性必修第一册)
更新时间:2022-07-02 16:33:05
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【推荐1】倾斜角为
的直线l经过抛物线
的焦点F,与抛物线相交于A,B两点,则弦AB的长为__ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15615de1a6df206dbd081251f676578e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
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【推荐2】已知抛物线的光学性质:由抛物线焦点射出的光线经抛物线反射之后对称轴方向射出.如图,在平面直角坐标系中,已知抛物线
:
,一条光线经过点
,沿与
轴平行方向射到抛物线
上,经过两次反射后经过点
射出,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14bd426e7e1e65d91394da0b28d49f65.png)
______ ,光线从点
到点
经过的总路程为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ac62b1ade07205ae2693ec1ab135def.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a11db9cfc93cd1134b388ff5fbeea0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b0145ad62ecc8ae00569ef2bd4ac5ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14bd426e7e1e65d91394da0b28d49f65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/2022/8/11/3042088303321088/3043073117356032/STEM/30b54bbf2f454a2399a73c247aecf294.png?resizew=175)
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【推荐1】设抛物线
的焦点为F,准线
与x轴的交点为K,点A在C上,已知点A的横坐标为
,
,则
的面积![](https://staticzujuan.xkw.com/quesimg/Upload/formula/439d373ebde1be9a18b83c7abee1cf59.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e6c830bfa9a1b979a1a9665166424bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c7c7b6f6f3e63b3529b5decdd50dc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3dda800348653ff51eb6b1c8318039.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/439d373ebde1be9a18b83c7abee1cf59.png)
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【推荐2】已知抛物线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa96c86a9085aeb7a57ce955200f0c80.png)
,过焦点
且斜率为
的直线与
相交于
,
两点,且
,
两点在准线上的投影分别为
,
两点,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1091e25713ac9062b2e93f04abc72c8d.png)
____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa96c86a9085aeb7a57ce955200f0c80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0261104a7c308433a0c0508ff20ea29a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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