2 |
2 |
PF2 |
PF1 |
2
| ||
3 |
OA |
OB |
OD |
2 |
2 |
2 |
|
|
5 |
1+k2 |
1+k2 |
(
|
|
2
| ||
3 |
(1+k2)(5-k2) |
(1-k2)2 |
5 |
9 |
5 |
7 |
|
|
|
OA |
OB |
5 |
3 |
4 |
3 |
OA |
OB |
OD |
OD |
8 |
3m |
4 |
3m |
64 |
9m2 |
16 |
9m2 |
4
| ||
3 |
4
| ||
3 |
4
| ||
3 |
2
| ||
3 |
| ||
3 |
|-
| ||||||||
|
2
| ||||
5 |
A.x2-y2=10 | B.x2+y2=10 | C.x2+y2=38 | D.x2-y2=38 |
A.椭圆 | B.线段 | C.不存在 | D.以上都不对 |
2 |
x2 |
4 |
y2 |
3 |
. |
OP |
. |
OA |
. |
OB |
10 |
7 |
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