2 |
A.2 | B.2
| C.
| D.2
|
2 |
a |
sinA |
b |
sinB |
asinB |
sinA |
2
| ||
sin45° |
3 |
3 |
2 |
A.30°或120° | B.30° | C.60°或120° | D.60° |
3 |
A.30° | B.30°或150° | C.60° | D.60°或120° |
A.a=1,b=2,c=3 | B.a=1,b=
| ||
C.a=1,b=2,∠A=100° | D.b=c=1,∠B=45° |
3 |
A.30° | B.60° | C.120° | D.60°或120° |
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