x2 |
a2 |
y2 |
b2 |
2 |
x0x |
a2 |
y0y |
b2 |
x 2 |
a2 |
y2 |
b2 |
x2 |
2b2 |
y2 |
b2 |
2 |
4 |
2b2 |
2 |
b2 |
2 |
x2 |
8 |
y2 |
4 |
x0x |
8 |
y0y |
4 |
|2x0-8| | ||
|
|2y0| | ||
|
2 | ||||||
|
2 | ||||
|
PA |
PB |
0 |
x2 |
a2 |
y2 |
b2 |
| ||
2 |
2 |
A.一条线段 | B.椭圆的一部分 |
C.双曲线的一部分 | D.抛物线的一部分 |
A.4条 | B.3条 | C.2条 | D.1条 |
2 |
2 |
PF2 |
PF1 |
3 |
OA |
OB |
OC |
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