OA |
OB |
OC |
AB |
AC |
A.
| B.
| ||||
C.0 | D.以上结果都不对 |
AB |
OB |
OA |
AC |
OC |
OA |
AB |
AC |
AB |
AC |
| ||||
|
|
9 | ||
3×
|
3 |
5 |
AB |
a |
AC |
b |
a |
b |
15 |
4 |
a |
b |
a |
b |
A.30° | B.-150° | C.150° | D.30°或150° |
a |
b |
a |
b |
2 |
a |
a |
b |
1 |
2 |
a |
b |
a |
b |
1 |
2 |
a |
b |
a |
b |
a |
b |
a |
b |
3 |
a |
b |
1 |
2 |
π |
6 |
A |
2 |
3 |
a |
b |
a |
b |
b |
A.
| B.
| C.
| D.
|
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