已知椭圆
的左、右焦点分别为
,
,
为
上一点,且
,若
关于
平分线的对称点
在
上,则
的离心率为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851a5d6ec23256f9b4a9e98aa92945fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
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22-23高三上·河北廊坊·开学考试 查看更多[5]
河北省三河市2023届高三上学期开学联考数学试题(已下线)专题38 椭圆及其性质-4(已下线)专题28 轻松搞定圆锥曲线离心率十九大模型-2(已下线)考向35 离心率的多种妙解方式(十四大经典题型)-1(已下线)技巧02 填空题的答题技巧(8大题型)(练习)
更新时间:2022-09-13 16:52:42
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填空题-双空题
|
适中
(0.65)
【推荐1】在
中,∠B=45°,
,M是BC的中点,
,则AC=______ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e93d7fd1aa177f3561fd18c1698b04c.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080ca48cd27d4bf9d9ef084b558fc17a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bc65473e403f44240bdb87279aa8227.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e93d7fd1aa177f3561fd18c1698b04c.png)
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【推荐2】设
的内角A,B,C所对边的长分别为a,b,c.若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5f1e5d29de6e4d72bfed62d9c14dde5.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e828a42806759882528ba43d1fed6b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5f1e5d29de6e4d72bfed62d9c14dde5.png)
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【推荐1】如图①,椭圆的光学性质:从椭圆的一个焦点发出的光线,经过椭圆反射后,反射光线经过椭圆的另一个焦点.如图②,双曲线的光学性质:从双曲线的一个焦点发出的光线,经过双曲线反射后,反射光线的反向延长线经过双曲线的另一个焦点.如图③,一个光学装置由有公共焦点
的椭圆
与双曲线
构成,已知
与
的离心率之比为
.现一光线从右焦点
发出,依次经
与
的反射,又回到了点
,历时
秒.将装置中的
去掉,如图④,此光线从点
发出,经
两次反射后又回到了点
,历时___________ .秒
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
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![](https://img.xkw.com/dksih/QBM/2022/5/21/2984179082108928/2984789463048192/STEM/a6a9fa57-c638-464c-97d0-570594f08da9.png?resizew=610)
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【推荐2】已知椭圆
,直线
交
于
两点,点
,则
的周长为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2242ca20bd7ab3d41b128e10a4071521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/900f7a883663d5e21f308844057e9a0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e298293515d3c5d8343b668fe8541d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ed4c4e8edbd179f3fc38a6653f18c1.png)
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【推荐1】已知椭圆
和双曲线
有相同的焦点
和
,设
和
的离心率分别为
,
,
为两曲线的一个公共点,且
(
为坐标原点).若
,则
的取值范围是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d33558881906c228c262ff8024dcfc4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a33a99190a8fd29c36d5a002e3197cc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/493b1f8c9d4ee69139c0384c1151e33d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b77e692d9a0002795edc2769c7b31b1.png)
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【推荐2】已知
、
分别为椭圆
(
)的左、右顶点,
是椭圆上的不同两点且关于
轴对称,设直线
的斜率分别为
、
,若点
到直线
的距离为1,则该椭圆的离心率为________ .
![](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/59e5886500df9d54c1bfdeefb174246d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beb524c1ed61704756d3af60e00be213.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b1b15a4605fce993cb13aefbf40360.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e6bd86df0db8034b7f07eefca723ac2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/272947fe57beb5814cb9c125101f72ba.png)
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解题方法
【推荐3】若两曲线在交点
处的切线互相垂直,则称这两条曲线在点
处正交.设椭圆
与双曲线
在交点处正交,则椭圆
的离心率为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40c1fb9f8b59508b1b58180c899d1787.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ea74737939c0f94c91229a7098f36ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a032dd225bdd793172220c494c2054e.png)
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