A.正方形 | B.矩形 | C.菱形 | D.平行四边形 |
AB |
DC |
AB |
DC |
AD |
AB |
AD |
AB |
AD |
OA |
OB |
OC |
AB |
AC |
a |
3 |
b |
a |
b |
a |
b |
a |
b |
A.(-1,-11) | B.(-1,11) | C.(1,-11) | D.(1,11) |
A.(x,-y) | B.(-x,-y) | C.(-y,-x) | D.(-x,y) |
AC |
1 |
2 |
CB |
CE |
1 |
4 |
ED |
A.(-8,-
| B.(-
| C.(0,1) | D.(0,1)或(2,
|
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