A.缩小2倍 | B.扩大2倍 | C.不变 | D.不能确定 |
a |
c |
b |
c |
2a |
2c |
a |
c |
2b |
2c |
b |
c |
3 |
4 |
A.0°<∠A<30° | B.30°<∠A<45° | C.45°<∠A<60° | D.60°<∠A<90° |
1 |
3 |
A.0°<∠A<30° | B.30°<∠A<45° | C.45°<∠A<60° | D.60°<∠A<90° |
1 |
5 |
A.都缩小
| B.都不变 | C.都扩大5倍 | D.仅tanA不变 |
A.sinA | B.cosA | C.tanA | D.cotA |
© 2017-2019 超级试练试题库,All Rights Reserved.