| x2 |
| 16 |
| y2 |
| 25 |
∴双曲线的焦点在y轴上，且c=3，
设双曲线方程为
| y2 |
| a2 |
| x2 |
| b2 |
∵两条准线间的距离为
| 10 |
| 3 |
∴
| 2a2 |
| c |
| 10 |
| 3 |
∴
| 2a2 |
| 3 |
| 10 |
| 3 |
∴a2=5，
∴b2=c2-a2=4
∴双曲线方程为
| y2 |
| 5 |
| x2 |
| 4 |
故选C．
| x2 |
| 16 |
| y2 |
| 25 |
| 10 |
| 3 |
| x2 |
| 4 |
| y2 |
| 5 |
| x2 |
| 5 |
| y2 |
| 3 |
| y2 |
| 5 |
| x2 |
| 4 |
| y2 |
| 5 |
| x2 |
| 3 |
| x2 |
| 16 |
| y2 |
| 25 |
| y2 |
| a2 |
| x2 |
| b2 |
| 10 |
| 3 |
| 2a2 |
| c |
| 10 |
| 3 |
| 2a2 |
| 3 |
| 10 |
| 3 |
| y2 |
| 5 |
| x2 |
| 4 |