BC |
BA |
AC |
AC |
BA |
BC |
BC |
A.
| B.
| C.
| D.1 |
BC |
BA |
AC |
AC |
BC |
BA |
AC |
AC |
BA |
AC |
BC |
AC |
AB |
BA |
BC |
| ||
2 |
1 |
2 |
1 |
2 |
3 |
| ||
2 |
b |
a |
a′ |
a |
2(
| ||||
|
|
b |
a |
b |
a′ |
b |
a |
a′ |
b |
a |
a′ |
b |
OA |
a |
OB |
b |
a |
b |
OC |
a |
b |
A. | B. | C. | D. |
m |
n |
m |
n |
1 |
2 |
1 |
2 |
A.相交但不过圆心 | B.相交过圆心 |
C.相切 | D.相离 |
a |
b |
a |
b |
π |
2 |
1 |
5 |
sin2α-2sin2α |
1-tanα |
OA |
OB |
OC |
PA |
PB |
PB |
PC |
PC |
PA |
NA |
NB |
NC |
0 |
A.重心,外心,垂心 | B.外心,垂心,重心 |
C.外心,重心,垂心 | D.内心,重心,外心 |
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