1 |
2 |
1 |
3 |
1 |
2 |
1 |
3 |
CD |
AD |
1 |
2 |
CD |
DB |
1 |
3 |
1 |
5 |
1 |
2 |
|
2
| ||
5 |
1-cos2A |
| ||
5 |
AC |
sin∠ADC |
CD |
sinA |
| ||||
|
| ||
5 |
| ||
5 |
3 |
A.30° | B.60° | C.30°或150° | D.60°或120° |
3 |
A.30°或150° | B.30° | C.60° | D.150° |
A.
| B.-
| C.0 | D.
|
x2 |
25 |
y2 |
16 |
x2 |
25 |
y2 |
16 |
sinA+sinC |
sinB |
A.直角三角形 | B.等腰三角形 |
C.等腰或直角三角形 | D.等腰直角三角形 |
© 2017-2019 超级试练试题库,All Rights Reserved.