x2 |
a2 |
y2 |
b2 |
5 |
4 |
A.±
| B.±
| C.±
| D.±
|
b2 |
a |
b2 |
a |
| ||
c |
b2 |
ac |
9k2 |
20k2 |
9 |
20 |
-
| ||
c |
b2 |
ac |
9k2 |
20k2 |
9 |
20 |
x2 |
25 |
y2 |
11 |
sinA-sinC |
sinB |
x2 |
a2 |
y2 |
b2 |
F1A |
AB |
A.3x±y=0 | B.x±3y=0 | C.2x±3y=0 | D.3x±2y=0 |
π |
4 |
π |
3 |
x2 |
a2 |
y2 |
b2 |
A.
| B.1+
| C.2
| D.2+
|
x2 |
a2 |
y2 |
b2 |
2
| ||
3 |
| ||
2 |
OM |
ON |
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