a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
a |
b |
b |
a |
b |
a |
b |
a |
b |
a•b |
|a||b| |
6 |
4×3 |
1 |
2 |
a |
b |
a |
b |
a |
a |
b |
b |
13 |
e |
e |
a |
e |
e |
b |
e |
e |
A.30° | B.60° | C.120° | D.150° |
a |
b |
2 |
a |
b |
a |
a |
b |
A.30° | B.45° | C.60° | D.75° |
AC |
BC |
a |
b |
a |
b |
a |
b |
a |
b |
A.30° | B.45° | C.60° | D.90° |
e1 |
e2 |
e1 |
e2 |
e1 |
A.
| B.
| C.
| D.
|
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