|OA |
OB |
AB |
A.[-2,2] | B.[2,2
| ||||
C.(-2
| D.[2,2
|
OA |
OB |
OC |
|OA |
OB |
AB |
OC |
AB |
OC |
1 |
2 |
AB |
2 |
|0+0+m| | ||
|
|m| | ||
|
2 |
|m| | ||
|
|
2 |
2 |
2 |
2 |
OA |
OB |
OC |
OA |
OB |
OA |
OB |
3 |
OC |
a |
b |
a |
b |
a |
c |
b |
c |
c |
A.
| B.
| C.
| D.
|
AB |
AC |
AB |
AC |
AM |
AB |
AC |
AM |
a |
b |
3 |
a |
b |
A.3 | B.
| C.1 | D.9 |
a |
b |
a |
b |
A.1 | B.
| C.3 | D.9 |
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