x2+y2 |
x2+(1-y)2 |
(1-x)2+y2 |
(1-x)2+(1-y)2 |
PA |
PD |
PB |
PC |
PA |
PC |
PB |
PD |
AP |
PC |
BP |
PD |
AP |
PC |
BP |
PD |
AC |
BD |
AC |
BD |
AC |
BD |
2 |
2 |
2 |
2 |
AP |
PC |
BP |
PD |
PC |
AP |
PD |
BP |
1 |
2 |
1 |
2 |
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 |
e1 |
e2 |
e1 |
3e2 |
e1 |
e2 |
A.k=4 | B.k=-4 | C.k=-9 | D.k=9 |
a |
b |
AB |
a |
b |
BC |
a |
b |
CD |
a |
b |
A.1 | B.2 | C.-2 | D.-1 |
a |
b |
a |
a |
b |
a |
b |
A.[0,
| B.[
| C.[
| D.[
|
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