已知椭圆
:
与直线
:
,
:
,过椭圆上的一点
作
,
的平行线,分别交
,
于
,
两点,若
为定值,则椭圆
的离心率为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd54b9df3402ad91e2d34c40efe0c7a.png)
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19-20高二上·浙江嘉兴·期末 查看更多[3]
浙江省嘉兴市2019-2020学年高二上学期期末数学试题(已下线)第07练 直线与圆锥曲线综合二:定值定点-2022年【寒假分层作业】高二数学(苏教版2019选择性必修第一册)(已下线)重难专攻(九)?圆锥曲线中的定值问题(核心考点集训)
更新时间:2020-02-05 22:47:28
|
【知识点】 求椭圆的离心率或离心率的取值范围
相似题推荐
填空题-单空题
|
较难
(0.4)
名校
解题方法
【推荐1】已知点
是抛物线
:
与椭圆
:
的公共焦点,
是椭圆
的另一焦点,P是抛物线
上的动点,当
取得最小值时,点P恰好在椭圆
上,则椭圆
的离心率为_______ .
![](https://img.xkw.com/dksih/QBM/2019/1/8/2114189458849792/2115618741764096/STEM/f6adb7a4e04643269a001ead24598d82.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2019/1/8/2114189458849792/2115618741764096/STEM/fee25de7e6e84b7ab60a68e3858e585b.png?resizew=14)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e48f28aeccf369df5980ac787e9e313f.png)
![](https://img.xkw.com/dksih/QBM/2019/1/8/2114189458849792/2115618741764096/STEM/915bc40e39ef43b6aa64037769e72acd.png?resizew=14)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2af95e1aebe75c904be4e7f4ac12f7db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e84e3a6855369ad6cb75ad7874f5d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
您最近一年使用:0次
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|
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(0.4)
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解题方法
【推荐2】已知
,
为椭圆E的左、右焦点,斜率为
的直线
与椭圆E交于为B、P,若以
为直径的圆过点
,则椭圆E的离心率为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3656055f5256cd06e636ea96e9f89c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
您最近一年使用:0次