π |
4 |
| ||
2 |
3 |
2-cos2θ |
|MA|•|MB| |
|AB| |
π |
4 |
| ||
2 |
| ||
2 |
| ||
2 |
3 |
2-cos2θ |
|
3 |
2 |
|
6k2 |
1+3k2 |
3k2-3 |
1+3k2 |
1+k2 |
1+k2 |
1+k2 |
|MA|•|MB| |
|AB| |
(1+k2)|x1-1||x2-1| | ||
|
| ||
|x1-x2| |
| ||||||
|
| ||
6 |
|
| ||
6 |
1+
|
| ||
6 |
|MA|•|MB| |
|AB| |
| ||
6 |
2 |
| ||
3 |
| ||
3 |
|MA|•|MB| |
|AB| |
(
| ||||
|
| ||
6 |
|MA|•|MB| |
|AB| |
| ||
6 |
| ||
3 |
|
1 |
3 |
A.1 | B.2 | C.3 | D.4 |
1 |
3 |
3a+1 |
2 |
1 |
2 |
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