x2 |
2 |
y2 |
4 |
PF1 |
PF2 |
2 |
2 |
PF1 |
2 |
PF2 |
2 |
PF1 |
PF2 |
x | 20 |
y | 20 |
| ||
2 |
| ||
4 |
x | 20 |
4-
| ||
2 |
4-
| ||
2 |
y | 20 |
2 |
2 |
2 |
|
2 |
2 |
2k(k-
| ||
2+k2 |
2k(k-
| ||
2+k2 |
k2-2
| ||
2+k2 |
k2+2
| ||
2+k2 |
4
| ||
2+k2 |
8k |
2+k2 |
yA-yB |
xA-xB |
2 |
2 |
|
2 |
2 |
2 |
2 |
|m| | ||
|
1 |
2 |
1 |
2 |
(4-
|
|m| | ||
|
|
|
2 |
2 |
2 |
2 |
A. | B. | C. | D. |
y2 |
4 |
2 |
x2 |
4 |
OB |
OA |
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