AB |
a |
b |
BC |
a |
b |
CD |
a |
b |
A.A、B、D三点共线 | B.A、B、C三点共线 |
C.B、C、D三点共线 | D.A、C、D三点共线 |
BD |
BC |
CD |
a |
b |
a |
b |
a |
b |
AB |
a |
b |
AB |
BD |
AB |
BD |
AB |
BD |
an |
2n |
a |
b |
a |
b |
A.
| B.-
| C.±
| D.2 |
a |
b |
a |
b |
b |
a |
b |
a |
a |
b |
a |
b |
a |
b |
b |
a |
b |
a |
b |
A.①② | B.①③ | C.①③④ | D.②③④ |
AO |
AB |
AC |
AB |
CB |
CD |
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