a2+b2-c2 |
2ab |
322+232-372 |
2×32×23 |
1 |
8 |
1-cos2C |
3
| ||
8 |
1 |
2 |
1 |
2 |
3
| ||
8 |
7 |
a2+b2-c2 |
4 |
A.30° | B.45° | C.60° | D.75° |
A.60° | B.90° | C.150° | D.120° |
A.m>2 | B.m>
| C.m≥
| D.0<m≤
|
A.10
| B.10
| C.100
| D.100
|
2 |
3 |
5 |
A.一定是锐角三角形 |
B.一定是直角三角形 |
C.一定是钝角三角形 |
D.可能是锐角三角形,也可能是钝角三角形 |
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