A.a=4,b=5,A=30°,有一解 | ||||
B.a=5,b=4,A=60°,有两解 | ||||
C.a=
| ||||
D.a=
|
a |
sinA |
b |
sinB |
bsinA |
a |
5sin30° |
4 |
5 |
8 |
4sin60° |
5 |
5
| ||
8 |
| ||
|
| ||
2 |
| ||
|
| ||
2 |
3 |
2 |
A.45°或135° | B.45° | C.135° | D.75° |
A.4
| B.4
| C.4
| D.
|
| ||
10 |
sinA |
a |
cosB |
b |
cosC |
c |
A.正三角形 |
B.有一内角为30°的等腰三角形 |
C.等腰直角三角形 |
D.有一内角为30°的直角三角形 |
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