n |
a1+a2+…+an |
1 |
n+2 |
lim |
n→∞ |
Sn+1 |
Sn |
4 |
5 |
bn+1 |
bn |
t2n+3 |
t2n+1 |
lim |
n→∞ |
Sn+1 |
Sn |
n+1 |
n |
t3(1-t2n) |
1-t2 |
Sn+1 |
Sn |
1-t2n+2 |
1-t2n |
lim |
n→∞ |
Sn+1 |
Sn |
lim |
n→∞ |
1-t2n+2 |
1-t2n |
lim |
n→∞ |
Sn+1 |
Sn |
lim |
n→∞ |
1-t2n+2 |
1-t2n |
lim |
n→∞ |
| ||
|
4 |
5 |
4 |
5 |
|
|
7 |
2 |
9 |
2 |
4 |
5 |
1 |
4x2 |
S1+S2+…+Sn |
n |
A.2016 | B.2011 | C.2010 | D.2009 |
f(n) |
n |
A.0 | B.5 | C.10 | D.20 |
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