A.90° | B.120° | C.135° | D.150° |
b2 +c2- a2 |
2bc |
11 |
14 |
5
| ||
14 |
a2 +b2- c2 |
2ab |
1 |
7 |
4
| ||
7 |
11 |
14 |
1 |
7 |
5
| ||
14 |
4
| ||
7 |
1 |
2 |
7 |
A.2 | B.3 | C.2或3 | D.4 |
A.30° | B.60° | C.120° | D.150° |
A.30° | B.45° | C.60° | D.120° |
7 |
A.30° | B.45° | C.60° | D.120° |
AB |
BC |
A.79 | B.69 | C.5 | D.-5 |
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