OA |
OB |
OA |
OB |
(x+1)2+y2 |
(x-1)2+y2 |
x2 |
4 |
y2 |
3 |
OA |
OB |
OA |
OB |
OA |
OB |
OA |
OB |
|
8km |
3+4k2 |
4m2-12 |
3+4k2 |
3m2-12k2 |
3+4k2 |
12 |
7 |
3 |
4 |
12 |
7 |
2
| ||
7 |
2
| ||
7 |
2 |
2 |
PF2 |
PF1 |
2
| ||
3 |
OA |
OB |
OD |
A.x2-y2=10 | B.x2+y2=10 | C.x2+y2=38 | D.x2-y2=38 |
A.椭圆 | B.线段 | C.不存在 | D.以上都不对 |
2 |
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