an |
2n |
an+1 |
2n+1 |
4an |
2n+1 |
4an-1 |
2n+1 |
an+1 |
2n+1 |
2an |
2n |
an-1 |
2n-1 |
an |
2n |
a1 |
2 |
1 |
2 |
a2 |
4 |
5 |
4 |
5 |
4 |
1 |
2 |
3 |
4 |
1 |
2 |
3 |
4 |
3 |
4 |
1 |
4 |
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 |
AC |
2 |
5 |
AB |
AC |
BC |
A.
| B.
| C.-
| D.-
|
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