2 |
ON |
ON |
A.
| B.2+
| C.2-
| D.2 |
ON |
2 |
ON |
2 |
2 |
π |
4 |
ON |
2 |
AB |
a |
AD |
b |
AC |
c |
a |
a |
b |
c |
AB |
AC |
BC |
OB |
OC |
OB |
OC |
OA |
A.等腰直角三角形 | B.直角三角形 |
C.等腰三角形 | D.等边三角形 |
A.F1,F3成90°角 | B.F1,F3成150°角 |
C.F2,F3成90°角 | D.F2,F3成60°角 |
a |
3 |
2 |
3 |
2 |
b |
x |
2 |
x |
2 |
π |
2 |
a |
b |
a |
b |
a |
b |
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