|CD| |
|AB| |
2 |
F2A |
F2B |
|CD| |
|AB| |
2 |
4 | ||
|
2 |
| ||
2 |
2 |
x2 |
2 |
1 |
2 |
1 |
2 |
3 |
2 |
(-
|
3 |
2 |
2 |
1 |
2 |
2 |
9 |
4 |
x2 |
2 |
2k2-2 |
1+2k2 |
-4k2 |
1+2k2 |
F2A |
F2B |
7k2-1 |
1+2k2 |
7 |
2 |
| ||
1+2k2 |
F2A |
F2B |
7 |
2 |
| ||
2 |
| ||
2 |
F2A |
F2B |
7 |
2 |
F2A |
F2B |
7 |
2 |
F2A |
F2B |
7 |
2 |
x2 |
a2 |
y2 |
b2 |
| ||
4 |
3 |
2 |
3 |
3 |
3 |
2 |
1-4y2 |
x2 |
a2 |
y2 |
b2 |
| ||
2 |
A.双曲线 | B.椭圆 | C.抛物线 | D.圆 |
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