双曲线
的焦距为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91403d0098ff1e9fa1db2e6c95287f51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
A.4 | B.8 | C.![]() | D.![]() |
更新时间:2019-04-07 19:11:33
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【知识点】 求双曲线的焦距