A.平行四边形 | B.梯形 | C.等腰梯形 | D.矩形 |
AB |
DC |
AB |
DC |
OA |
OB |
OC |
BM |
MC |
OA |
OB |
OC |
OB |
x2 |
25 |
y2 |
9 |
PF1 |
PF2 |
PQ |
PF1 |
PF2 |
a |
b |
a |
b |
A.
| B.
| ||||||||||||
C.
| D.(
|
a |
b |
c |
a |
c |
b |
c |
π |
3 |
OA |
a |
OB |
b |
OD |
d |
a |
b |
d |
c |
AB |
AC |
AE |
A.BC边的垂直平分线上 |
B.BC边的中线所在的直线上 |
C.BC边的高线所在的直线上 |
D.BC边所在的直线上 |
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