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1 . 已知抛物线C:
经过点
,A,B是抛物线C上异于点O的不同的两点,其中O为原点.
(1)求抛物线C的方程,并求其焦点坐标和准线方程;
(2)若
,求
面积的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/642bade9e30b7a60c2b3b7d48d87d4f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/219ba9eec5169a9844614fe8bcce5b0a.png)
(1)求抛物线C的方程,并求其焦点坐标和准线方程;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87be53262d72dda5dd55d79ab20ff0b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65a9354a07397b21c33820fc2590e814.png)
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2020-01-20更新
|
722次组卷
|
2卷引用:天津市和平区2019-2020学年高二上学期期末数学试题
解题方法
2 . 已知在直角坐标系
中,抛物线
(
为参数)的焦点为
,以坐标原点为极点,
轴的非负半轴为极轴建立极坐标系,直线
的极坐标方程为
,若直线
与曲线
交于
、
两点,与
轴相交于点
,
,
则
与
的面积之比![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad857a11437d25816854dd609c834123.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ab4d61beecbb6a7193736820ca8dee0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38ec501696478e97604a578bfdeb1046.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d609cb7f8b4d79e8b65c0b8a0672d240.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12d016b9cfab97e18ea6193ac309f9d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a00d05c60999eff91345a545fb57e9af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30f221c6eff7ed25794b7fe387bee22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad857a11437d25816854dd609c834123.png)
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