π |
3 |
2π |
3 |
1 |
S12 |
1 |
S22 |
2 |
3 |
| ||
2 |
| ||
3 |
π |
6 |
GM | ||
sin
|
GA | ||
sin(π-α-
|
| ||
6sin(α+
|
1 |
2 |
sinα | ||
12sin(α+
|
sinα | ||
12sin(α-
|
1 | ||
|
1 | ||
|
144 |
sin2α |
π |
6 |
π |
6 |
π |
3 |
2π |
3 |
π |
3 |
2π |
3 |
π |
2 |
A.2 | B.4 | C.1 | D.3 |
A.b=20,A=45°,C=80° | B.a=30,c=28,B=60° |
C.a=14,b=16,A=45° | D.a=12,c=15,A=120° |
6 |
A.有一个解 | B.有两个解 | C.不能确定 | D.无解 |
C |
2 |
A.直角三角形 | B.等腰三角形 | C.锐角三角形 | D.钝角三角形 |
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