题干
已知椭圆
+
=1(a>b>0) ，点P（
a,
a ）在椭圆上．
| x |
| 2 |
| a |
| 2 |
| y |
| 2 |
| b |
| 2 |
| 5 |
| 5 |
| 2 |
| 2 |
