x2 |
4 |
y2 |
3 |
OA |
OB |
OA |
OB |
1 |
2 |
OA |
OB |
OA |
OB |
OA |
OB |
(y1y2)2 |
16 |
y1y2 |
16 |
OA |
OB |
OA |
OB |
OA |
OB |
1 |
k |
|
4 |
k2 |
4 |
k |
|
1 |
2 |
|
1 |
2 |
1 |
2 |
|0-(-2)| | ||
|
2
| ||
5 |
x2 |
25 |
y2 |
9 |
PA |
AF |
PB |
BF |
A.-
| B.-
| C.
| D.
|
x2 |
4 |
y2 |
2 |
A.
| B.
| C.
| D.
|
x2 |
4 |
A.r∈(0,1] | B.r∈(1,2] | C.r∈(
| D.r∈[
|
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