OA |
OB |
BA |
A.-5+5i | B.-5-5i | C.5+5i | D.5-5i |
OA |
OB |
BA |
OA |
OB |
AB |
BC |
AC |
A.(-3,-7) | B.(3,7) | C.(-1,-1) | D.(1,1) |
A.若向量
| ||||||||
B.在△ABC中,
| ||||||||
C.四边形ABCD是菱形的充要条件是
| ||||||||
D.点G是△ABC的重心,则
|
AB |
AC |
AD |
A.(2,4) | B.(1,1) | C.(-1,-1) | D.(-2,-4) |
MN |
MP |
NQ |
QP |
AB |
a |
AD |
b |
a |
b |
a |
b |
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