题干
设椭圆C：
+
=1 （a＞2 2 ）的右焦点为F，右顶点为A，上顶点为B，且满足
+
=
，其中O 为坐标原点，e为椭圆的离心率．
| x |
| 2 |
| a |
| 2 |
| y |
| 2 |
| 8 |
| 1 |
| | |
| O |
| F |
| | |
| 1 |
| | |
| O |
| A |
| | |
| 8 |
| e |
| | |
| F |
| A |
| | |
