如图,把椭圆
的长轴
八等分,过每个分点作
轴的垂线交椭圆的上半部分于
,
,
,
七个点,
是椭圆的一个焦点,则
的值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d80a47fd46072cd717442cb378d431ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9cb8e6ff801523b0304576cd69fd2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb82d62ae6889a177c70d3adf8a91056.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5078345cf8d23cac0748b61b0ee7aac.png)
![](https://img.xkw.com/dksih/QBM/2018/1/11/1858249231933440/1859420087115776/STEM/71d02e41ff7b42b4be1944201df81919.png?resizew=205)
更新时间:2018-01-13 11:42:45
|
【知识点】 椭圆上点到焦点的距离及最值
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【推荐2】已知双曲线
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