3 |
A.
| B.3 | C.4 | D.
|
3 |
1 |
2 |
3 |
| ||
2 |
16+25-2•4•5•
|
21 |
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 |
2 |
A.B=45°或135° | B.B=135° |
C.B=45° | D.以上答案都不对 |
3 |
A.3-
| B.
| C.2 | D.3+
|
π |
3 |
3 |
a+b-c |
sinA+sinB-sinC |
A.(2,2
| B.2
| C.(
| D.(2,2
|
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