A.A=60°,B=75°,c=1 | B.a=5,b=10,A=15° |
C.a=5,b=10,A=30° | D.a=15,b=10,A=30° |
a |
sinA |
b |
sinB |
bsinA |
a |
10sin15° |
5 |
| ||||
2 |
a |
sinA |
b |
sinB |
bsinA |
a |
10×
| ||
5 |
a |
sinA |
b |
sinB |
bsinA |
a |
10×
| ||
15 |
1 |
3 |
5 |
π |
4 |
a |
sinA |
2c | ||
|
7 |
3
| ||
2 |
A.△ABC中,a=7,b=14,A=30°有两解 |
B.△ABC中,a=30,b=25,A=150°有一解 |
C.△ABC中,a=6,b=9,A=45°有两解 |
D.△ABC中,b=9,c=10,B=60°无解 |
3 |
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