OA |
OB |
OC |
OA |
OB |
OA |
OC |
OA |
OB |
OC |
3 |
OC |
OA |
OB |
OA |
OB |
OA |
OB |
OC |
3 |
AB |
BD |
DC |
AB |
BD |
BD |
DC |
AB |
BD |
BD |
DC |
AB |
DC |
AC |
A.2 | B.2
| C.4 | D.4
|
a |
e |
e |
b |
e |
e |
e |
e |
c |
e |
e |
d |
a |
b |
c |
x2+y2 |
x2+(1-y)2 |
(1-x)2+y2 |
(1-x)2+(1-y)2 |
OB |
OC |
OA |
A.1 | B.1/2 | C.1/3 | D.1/4 |
OM |
OB |
OA |
A.点M在线段AB上 | B.点B在线段AM上 |
C.点A在线段BM上 | D.O、A、M、B四点一定共线 |
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