AD |
| ||
|
|
| ||
|
|
AB |
AC |
AB |
a |
AC |
b |
a |
b |
BD |
A.
| B.
| C.-
| D.
|
AB |
a |
AC |
b |
BC |
AC |
AB |
b |
a |
AD |
| ||
|
|
| ||
|
|
BD |
DC |
AB |
AC |
1 |
2 |
BD |
1 |
3 |
BC |
1 |
3 |
b |
1 |
3 |
a |
x2 |
a2 |
y2 |
b2 |
DF1 |
DA |
2DF2 |
A.
| B.
| C.
| D.
|
PA |
PB |
PC |
AB |
A.点P在△ABC外部 | B.点P在线段AB上 |
C.点P在线段BC上 | D.点P在线段AC上 |
OA |
OB |
OC |
0 |
AC |
AB |
AD |
a |
b |
a |
b |
CB |
1 |
2 |
OA |
OA |
a |
OC |
b |
AB |
A.
| B.
| C.
| D.
|
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