a |
b |
a |
a |
b |
| ||
2 |
a |
b |
b |
a |
b |
3 |
4 |
a |
a |
b |
b |
3 |
4 |
b |
1 |
2 |
b |
3 |
4 |
b |
b |
1 |
2 |
1 |
2 |
a |
b |
a |
b |
A.(-
| B.(2,+∞) | C.(-
| D.(-∞,-
|
b |
a |
a |
c |
5 |
a |
b |
c |
5 |
2 |
a |
c |
A.30° | B.60° | C.120° | D.150° |
A.120° | B.90° | C.60° | D.30° |
e1 |
e2 |
a |
e1 |
e2 |
b |
e1 |
e2 |
a |
b |
a |
3 |
b |
2 |
a |
b |
a |
b |
a |
b |
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