x2 |
9 |
y2 |
4 |
3 |
3 |
x2 |
9 |
y2 |
4 |
|
3 |
3 |
|6cosθ-2
| ||||
|
3
| ||||
|
7
| ||
|
21 |
21 |
x2 |
a2 |
y2 |
b2 |
2
| ||
3 |
x2 |
8 |
y2 |
5 |
x2 |
a2 |
y2 |
b2 |
x2 |
a2 |
y2 |
b2 |
A.e1e2>e3 | B.e1e2=e3 | C.e1e2<e3 | D.e1e2≥e3 |
x2 |
a2 |
y2 |
b2 |
A.
| B.
| C.
| D.
|
x2 |
9 |
y2 |
4 |
A.6 | B.7 | C.8 | D.9 |
x2 |
4 |
x2 |
4 |
15 |
8 |
A.1 | B.
| C.2 | D.4 |
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