A.b=10,A=45°,C=70° | B.a=60,c=48,B=60° |
C.a=7,b=5,A=80° | D.a=14,b=16,A=45° |
a |
sinA |
b |
sinB |
c |
sinC |
10×
| ||||
sin65° |
5
| ||
sin65° |
10sin70° |
sin65° |
a |
sinA |
b |
sinB |
5sin80° |
7 |
a |
sinA |
b |
sinB |
16×
| ||||
14 |
4
| ||
7 |
| ||
2 |
A.等边三角形 |
B.等腰三角形但不是等边三角形 |
C.等腰直角三角形 |
D.直角三角形但不是等腰三角形 |
2 |
A.一解或两解 | B.两解 | C.一解 | D.无解 |
A.
| B.
| C.
| D.
|
A.1 | B.-1 | C.2
| D.-2
|
2 |
A.60° | B.60°或120° | C.30° | D.30°或150° |
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