已知AB是抛物线
上任意一条焦点弦,且
、
.
(1)求证:
,
;
(2)若弦AB被焦点分成长为m、n的两部分,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3764ba3aa0a241787f4661026bb14053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d97517502c30a6c91fb5b2202dc1c230.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38e8dabe9d450189263c29b395ffad37.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af529571cca0e6957a197fe3f878d419.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cfba8278d7d4e13681c828abda68df1.png)
(2)若弦AB被焦点分成长为m、n的两部分,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50def45220db72c097c677ecb69cca0.png)
更新时间:2022-04-20 10:32:54
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【推荐1】已知动圆过定点P(1,0),且与定直线l:x=﹣1相切.
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【推荐2】已知抛物线C:
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(1)过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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【推荐2】已知抛物线
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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