an |
2an+1 |
A.13 | B.
| C.11 | D.
|
an |
2an+1 |
a1 |
2a1+1 |
1 |
3 |
a2 |
2a2+1 |
1 |
5 |
a3 |
2a3+1 |
1 |
7 |
a4 |
2a4+1 |
1 |
9 |
a5 |
2a5+1 |
1 |
11 |
A.8 | B.9 | C.8或9 | D.7 |
Sn |
Tn |
7n+1 |
4n+27 |
A.4:3 | B.3:2 | C.7:4 | D.78:71 |
a | 2n |
sn |
(n+50)sn+1 |
n(an+1) |
2 |
1 |
(2an+1)(2an-1) |
k |
57 |
A.130 | B.170 | C.210 | D.260 |
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