椭圆
的焦距长是________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f64b7ab668d61bcb8ec6d195c672a81e.png)
更新时间:2018-11-25 18:13:11
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【知识点】 求椭圆的焦点、焦距
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【推荐1】椭圆
的左焦点
坐标为_____ ,以
为焦点、坐标原点为顶点的抛物线方程为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cae00bdc6f8b564b6b15b32572c848b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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(0.94)
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【推荐2】椭圆
经过
变换后所得曲线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45bcd8f6ede8cc2513ad41402f40086.png)
的焦点坐标为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdfa8e3d36d88de8c35ac6182e58d767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2af773e9fadbc0b33ce67180c26f730e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45bcd8f6ede8cc2513ad41402f40086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31ef73bd07011d88bab2e4223b2631af.png)
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