x2 |
2 |
OA |
OB |
2 |
3 |
OA |
OB |
2 |
3 |
3 |
4 |
|b| | ||
|
k2+1 |
|
4kb |
2k2+1 |
2b2-2 |
2k2+1 |
OA |
OB |
k2+1 |
2k2+1 |
OA |
OB |
2 |
3 |
2 |
2 |
2 |
k2+1 |
2k2+1 |
2 |
3 |
3 |
4 |
2 |
3 |
k2+1 |
2k2+1 |
3 |
4 |
1 |
2 |
k2+1 |
2
| ||
2k2+1 |
1 |
2 |
| ||
2k2+1 |
| ||
2 |
1-
|
| ||
4 |
2 |
3 |
a |
b |
c |
a |
b |
c |
0 |
a |
b |
a |
b |
c |
A.1 | B.
| C.2 | D.
|
a |
b |
a |
b |
A.互相平行 | B.互相垂直 | C.夹角为30° | D.夹角为60° |
BC |
CA |
AB |
c |
BC |
a |
CA |
b |
a |
b |
b |
c |
c |
a |
A.
| B.-
| C.
| D.-
|
AP |
BP |
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