x2 |
a2 |
y2 |
b2 |
|PF1|2 |
|PF2| |
A.(0,+∞) | B.(1,2] | C.(1,
| D.(1,3] |
x2 |
a2 |
y2 |
b2 |
|PF1|2 |
|PF2| |
(2a+|PF2|)2 |
|PF2| |
4a2 |
|PF2| |
4a2 |
|PF2| |
x2 |
4 |
y2 |
9 |
x2 |
36 |
y2 |
m |
A.x±2y=0 | B.2x±y=0 | C.x±4y=0 | D.4x±y=0 |
x2 |
a2 |
y2 |
b2 |
3 |
A.(1,
| B.[
| C.[
| D.[
|
y2 |
4 |
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