a |
b |
c |
a |
c |
b |
c |
c |
a |
b |
a |
b |
c |
a |
c |
b |
c |
a |
c |
b |
c |
1 |
2 |
1 |
2 |
| ||
2 |
c |
2 |
2 |
OA |
AB |
AC |
0 |
OA |
OB |
AB |
CA |
CB |
A.
| B.
| C.3 | D.
|
BC |
a |
CA |
b |
AB |
c |
a |
b |
b |
c |
c |
a |
A.-
| B.0 | C.
| D.3 |
a |
b |
π |
3 |
a |
b |
. |
a |
. |
b |
. |
a |
. |
b |
OA |
OC |
OB |
AC |
A.0 | B.2 | C.4 | D.5 |
a |
b |
c |
a |
c |
b |
c |
a |
b |
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