x2 |
a2 |
y2 |
b2 |
QF2 |
F2P |
A.2 | B.
| C.
| D.
|
a |
b |
a |
b |
|
|
a2 |
c |
ab |
c |
|
|
a2c |
a2-b2 |
abc |
b2-a2 |
QF2 |
-b2c |
a2-b2 |
abc |
b2-a2 |
F2P |
b2 |
c |
ab |
c |
QF2 |
F2P |
2
| ||
3 |
x |
2 |
x2 |
4 |
y2 |
5 |
A.
| B.
| C.
| D.
|
x2 |
25 |
y2 |
9 |
x2 |
25-k |
y2 |
9+k |
A.实轴长相等 | B.虚轴长相等 | C.离心率相等 | D.焦距相等 |
3
| ||
5 |
x2 |
a2 |
y2 |
4 |
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