3 |
a+b+c |
sinA+sinB+sinC |
A.1 | B.2
| C.4 | D.4
|
3 |
a |
sinA |
2
| ||
sin60° |
a+b+c |
sinA+sinB+sinC |
2RsinA+2RsinB+2RsinC |
sinA+sinB+sinC |
3 |
A.
| B.
| C.
| D.
|
A.5
| B.10
| C.
| D.5
|
A.一解 | B.两解 | C.无解 | D.以上都不对 |
A.一解 | B.两解 | C.一解或两解 | D.无解 |
A.2
| B.2+2
| C.
| D.2
|
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