a |
b |
c |
A.|
| B.|(
| ||||||||||||||||||||||||
C.|(
| D.|(
|
b |
a |
(x2y1)2+(x1y2)2 |
a |
b |
(x2y1)2+(x1y2)2 |
a |
b |
c |
b |
c |
a |
a |
b |
c |
b |
c |
a |
b |
a |
c |
a |
b |
c |
b |
a |
c |
a |
b |
c |
b |
a |
c |
c |
a |
b |
a |
b |
c |
c |
a |
b |
3 |
AE |
AB |
AE |
AC |
A.3 | B.2 | C.
| D.
|
AB |
AP |
AB |
AP |
OP′ |
a |
b |
π |
2 |
a |
b |
a |
b |
a |
a |
•b |
b |
2 |
AB |
AF |
2 |
AE |
BF |
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