. |
AB |
. |
c |
. |
BC |
. |
a |
. |
CA |
. |
b |
. |
a |
. |
b |
. |
a |
. |
b |
. |
a |
. |
b |
. |
b |
. |
c |
. |
c |
. |
a |
. |
b |
. |
c |
A.1 | B.2 | C.3 | D.4 |
. |
a |
. |
b |
. |
a |
. |
b |
. |
a |
. |
b |
. |
b |
. |
c |
. |
a |
. |
c |
. |
b |
. |
BC |
. |
BA |
. |
AC |
. |
a |
. |
b |
. |
c |
0 |
. |
a |
. |
a |
. |
b |
. |
c |
a |
b |
a |
b |
b |
a |
a |
b |
b |
a |
b |
a |
b |
a |
A.12 | B.6 | C.4 | D.2 |
OA |
OB |
π |
3 |
OA |
OB |
OA |
OM |
A.
| B.2
| C.
| D.2
|
AB |
AC |
AB |
AC |
19 |
m1 |
m2 |
a |
m1 |
m2 |
b |
m1 |
m2 |
a |
b |
a |
b |
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