2 |
x2 |
a2 |
y2 |
b2 |
2 |
2 |
1 |
2 |
|
2 |
x2 |
8 |
y2 |
4 |
|PF1| |
|PF2| |
|QF1| |
|QF2| |
|PF1| | ||
4
|
|QF1| |
4 |
2 |
2 |
|
2 |
2 |
2 |
|1+2| |
3 |
2 |
2 |
|1+2| |
3 |
2 |
x2 |
4 |
y2 |
3 |
3 |
2 |
A.2
| B.2
| C.5 | D.3 |
A.椭圆 | B.不存在 | C.椭圆或线段 | D.线段 |
A.椭圆 | B.直线 | C.圆 | D.线段 |
3 |
3 |
OA |
OB |
OA |
OB |
p |
2 |
|PA| |
|PB| |
16 |
5 |
5 |
4 |
x2 |
16 |
y2 |
9 |
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