S2007 |
2007 |
S2005 |
2005 |
A.-2007 | B.-2012 | C.2007 | D.2008 |
n(n-1) |
2 |
Sn |
n |
n(n-1) |
2 |
Sn+1 |
n+1 |
Sn |
n |
d |
2 |
Sn |
n |
d |
2 |
S2007 |
2007 |
S2005 |
2005 |
d |
2 |
2012(2012-1) |
2 |
A.4 | B.3 | C.2 | D.1 |
A.7 | B.8 | C.9 | D.10 |
Sn+64 |
an |
A.7 | B.
| C.8 | D.
|
A.3 | B.5 | C.7 | D.9 |
A.0 | B.2 | C.2009 | D.4018 |
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