1 . 若抛物线C:
,且A、B两点在抛物线上,F为焦点,下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
A.若A、B、F共线,则![]() |
B.若![]() ![]() |
C.经过点![]() |
D.若![]() |
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解题方法
2 . 已知抛物线
,点
在抛物线
上,直线
在点
下方,直线l与抛物线
交于B,
两点.
(1)证明:
内切圆的圆心在定直线上:
(2)求
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64447af8454c613a58b11d9274d3da2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b47c72021f9efe9a20134199ac18ee4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01d7e7f0c9d22ae7edaeec1ee6bdfc6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b47c72021f9efe9a20134199ac18ee4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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