名校
解题方法
1 . 如图,某同学用两根木条钉成十字架,制成一个椭圆仪.木条中间挖一道槽,在另一活动木条
的
处钻一个小孔,可以容纳笔尖,
各在一条槽内移动,可以放松移动以保证
与
的长度不变,当
各在一条槽内移动时,
处笔尖就画出一个椭圆
.已知
,且
在右顶点时,
恰好在
点,则
的离心率为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/5/c8320702-1e97-4658-967f-4eab2c28e36d.png?resizew=188)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/300d23c67610bf941f57edf1359dfbb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/5/c8320702-1e97-4658-967f-4eab2c28e36d.png?resizew=188)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2023-05-04更新
|
1046次组卷
|
5卷引用:江西省大余中学2022-2023学年高二下学期期末学情调研数学试题
解题方法
2 . 如图,已知
,图中的一系列圆是圆心分别
、
的两组同心圆,每组同心圆的半径分别是1,2,3,…,
,利用这两组同心圆可以画出以
、
为焦点的椭圆,设其中经过点
、
、
的椭圆的离心率分别是
,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/2755f7b1-aecd-47d9-add3-870819a5fbd7.png?resizew=253)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e48867e261c61d24a0a1a4f7ff4627c3.png)
![](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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaa272ab1c6638acd1712cfb478fe0bf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/2755f7b1-aecd-47d9-add3-870819a5fbd7.png?resizew=253)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2020-04-09更新
|
244次组卷
|
5卷引用:河北省武邑中学2019-2020学年高二下学期3月线上月考数学试题