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.![]() |
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2023-05-04更新
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1045次组卷
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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