1 |
anan+1 |
4 |
2 |
1 |
anan+1 |
1 |
(3n-1)(3n+2) |
1 |
3 |
1 |
3n-1 |
1 |
3n+2 |
1 |
3 |
1 |
2 |
1 |
5 |
1 |
5 |
1 |
8 |
1 |
3n-1 |
1 |
3n+2 |
1 |
3 |
1 |
2 |
1 |
3n+2 |
n |
2(3n+2) |
1 |
bn |
3 |
4 |
A.a1+a20 | B.a5+a17 | C.a27+a35 | D.a15+a26 |
S2008 |
2008 |
S2005 |
2005 |
A.2008 | B.2009 | C.-2008 | D.-2009 |
A.120 | B.150 | C.180 | D.200 |
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