1 |
2 |
1 |
Sn |
Sn |
2n+1 |
1 |
4 |
1 |
2 |
1 |
2 |
1 |
Sn |
1 |
Sn-1 |
1 |
S1 |
1 |
Sn |
1 |
Sn |
1 |
2n-1 |
2 |
(2n-1)(2n-3) |
|
Sn |
2n+1 |
1 |
2 |
1 |
2n-1 |
1 |
2n+1 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
5 |
1 |
2n-1 |
1 |
2n+1 |
1 |
2 |
1 |
2n+1 |
n |
2n+1 |
x |
2x+1 |
1 |
2 |
1 |
2x+1 |
1 |
3 |
1 |
2 |
1 |
2 |
1 |
4 |
1 |
2 |
1 |
4 |
an |
2n |
1 |
S1 |
1 |
S2 |
1 |
S3 |
1 |
Sn |
2 |
2 |
A.6 | B.-6 | C.±6 | D.±12 |
b |
a2-a1 |
A.2 | B.±2 | C.±
| D.0或2 |
A.60 | B.45 | C.36 | D.18 |
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