2 |
2 |
8 |
3 |
OA |
OB |
x2 |
a2 |
y2 |
b2 |
2 |
x2 |
2b2 |
y2 |
b2 |
2 |
4 |
2b2 |
2 |
b2 |
x2 |
8 |
y2 |
4 |
2
| ||
3 |
2
| ||
3 |
2
| ||
3 |
2
| ||
3 |
2
| ||
3 |
OA |
OB |
4km |
1+2k2 |
2m2-8 |
1+2k2 |
m2-8k2 |
1+2k2 |
8 |
3 |
|m| | ||
|
|
OA |
OB |
3m2-8k2-8 |
1+2k2 |
OA |
OB |
OM |
CM |
y |
x |
A.
| B.
| C.
| D.
|
x2 |
2 |
OA |
OB |
2 |
3 |
OA |
OB |
2 |
3 |
3 |
4 |
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 |
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