已知椭圆C:
=1,直线l过椭圆C的左焦点F且交椭圆于A,B两点,AB的中垂线交x轴于M点,则
的取值范围为__ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd05c7cd9d617a9ac8d093c3e89fac3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd24166997ab0500ba54c9f35d938fef.png)
21-22高二·全国·课后作业 查看更多[2]
(已下线)2.2 椭圆(提高练)-2021-2022学年高二数学同步训练精选新题汇编(人教A版选修2-1)(已下线)第三章 圆锥曲线的方程(提分小卷)-【单元测试】2021-2022学年高二数学尖子生选拔卷(人教A版2019选择性必修第一册)
更新时间:2021-08-28 22:31:43
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【推荐1】已知椭圆
,过原点
作两条互相垂直的射线交椭圆于
、
两点,则弦长
的取值范围为_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d80a47fd46072cd717442cb378d431ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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【推荐2】已知点
在曲线
:
上,斜率为
的直线
与曲线
交于
,
两点,且
,
两点与点
不重合,有下列结论:
(1)曲线
有两个焦点,其坐标分别为
,
;
(2)将曲线
上所有点的横坐标扩大为原来的
倍(纵坐标不变),得到的曲线是一个圆;
(3)
面积的最大值为
;
(4)线段
长度的最大值为3.
其中所有正确结论的序号是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e1624ce2eee9487238b41c3c7e8ffc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43dc2f88602ce5febe38e6cea6dbc77b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(1)曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86b36a0866ec5fbb94e6cf4d61579e0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb374fd349306abf2f784b6a28d93a7.png)
(2)将曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
(4)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
其中所有正确结论的序号是
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解题方法
【推荐1】已知椭圆
,
为椭圆内一定点,过点
的弦与椭圆交于
两点,若使得三角形
面积为
的弦
存在两条,则
取值范围为_________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cae00bdc6f8b564b6b15b32572c848b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5343f6dee6d12906b09ff03166350a5.png)
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名校
解题方法
【推荐2】已知点
是椭圆
上的动点,
,
分别为椭圆的左右焦点,
为坐标原点,若
是
的角平分线上的一点,且
,则
的取值范围是_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb4717d7fa6d522090c5e949f650bd8.png)
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