y2 |
3 |
A.y=±
| B.x=±
| C.y=3x | D.x=
|
x2 |
a2 |
y2 |
b2 |
b |
a |
y2 |
3 |
| ||
1 |
3 |
x2 |
a2 |
y2 |
9 |
x2 |
a2 |
y2 |
b2 |
| ||
4 |
A.2或
| B.
| C.2 | D.4 |
A.tanα+tanβ+tanγ=0 | B.tanα+tanβ-tanγ=0 |
C.tanα+tanβ+2tanγ=0 | D.tanα+tanβ-2tanγ=0 |
x2 |
a2 |
y2 |
b2 |
PF1 |
PF2 |
2c2 |
3 |
x2 |
2 |
y2 |
4 |
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