5 |
2 |
1 |
2 |
a1(1-q4) |
1-q |
a1(1-q)(1+q)(1+q2) |
1-q |
5 |
2 |
5 |
2 |
3 |
2 |
5 |
2 |
n(b1+bn) |
2 |
n(
| ||||
2 |
n(n+4) |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
an |
a1 |
an |
an |
an-1 |
an |
1 |
2 |
a1 |
a2 |
an |
a1 |
b1 |
b2 |
bn |
OBn |
b1 |
b2 |
bn |
lim |
n→∞ |
lim |
n→∞ |
1 |
a1 |
1 |
a2 |
1 |
a3 |
1 |
a4 |
1 |
a5 |
1 |
an |
n |
(2n+1)Sn |
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