Sn |
Tn |
3n+2 |
4n-5 |
a5 |
b5 |
a5 |
b5 |
2a5 |
2b5 |
a1+a9 |
b1+b9 |
| ||
|
S9 |
T9 |
Sn |
Tn |
3n+2 |
4n-5 |
S9 |
T9 |
29 |
36-5 |
29 |
31 |
29 |
31 |
A.S2007=2007,a2004<a4 | B.S2007=2007,a2004>a4 |
C.S2007=2008,a2004≤a4 | D.S2007=2008,a2004≥a4 |
1 |
an |
1 |
an |
Sn |
n+c |
1 |
bn•bn+1 |
3 |
5 |
1 |
an-1 |
1 |
an-1 |
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