9 |
5 |
9 |
5 |
CB2-BD2 |
32-(
|
12 |
5 |
AC2-CD2 |
42-(
|
16 |
5 |
16 |
5 |
9 |
5 |
16 |
5 |
9 |
5 |
2 |
6 |
2 |
A.2 | B.
| C.
| D.
|
A.△ABC中,若∠B=∠C-∠A,则△ABC是直角三角形 |
B.△ABC中,若a2=(b+c)(b-c),则△ABC是直角三角形 |
C.△ABC中,若∠A:∠B:∠C=3:4:5,则△ABC是直角三角形 |
D.△ABC中,若a:b:c=5:4:3,则△ABC是直角三角形 |
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