a |
b |
a |
b |
b |
A.(1,
| B.(
| C.(1,±
| D.(
|
b |
| ||||
|
|
x |
1×2 |
| ||
2 |
3 |
b |
3 |
3 |
a |
b |
a |
A.30° | B.45° | C.60° | D.90° |
a |
b |
a |
b |
a |
a |
b |
a |
b |
a |
b |
8 |
9 |
A.2 | B.-2 | C.-2或
| D.2或-
|
e1 |
e2 |
a |
e1 |
e2 |
b |
e1 |
e2 |
a |
b |
A.t>-1 且t≠1 | B.t>-1 | C.t<1 且t≠-1 | D.t<1 |
a |
b |
c |
5 |
a |
b |
c |
5 |
2 |
a |
c |
A.30° | B.60° | C.120° | D.150° |
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