3 |
A.30° | B.60° | C.30°或150° | D.60°或120° |
3 |
a |
sinA |
b | ||||
|
a |
sinA |
b |
sinB |
b |
sinB |
b | ||||
|
| ||
2 |
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 |
4 |
9 |
BD |
DC |
AB |
AC |
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