Sn |
Tn |
2n |
3n+1 |
∴
an |
bn |
a1+a2n−1 |
b1+b2n−1 |
S2n−1 |
T2n−1 |
2(2n−1) |
3(2n−1)+1 |
2n−1 |
3n−1 |
∴
lim |
n→∞ |
an |
bn |
lim |
n→∞ |
2n−1 |
3n−1 |
lim |
n→∞ |
2−
| ||
3−
|
2 |
3 |
故答案为:
2 |
3 |
Sn |
Tn |
2n |
3n+1 |
lim |
n→∞ |
an |
bn |
Sn |
Tn |
2n |
3n+1 |
an |
bn |
a1+a2n−1 |
b1+b2n−1 |
S2n−1 |
T2n−1 |
2(2n−1) |
3(2n−1)+1 |
2n−1 |
3n−1 |
lim |
n→∞ |
an |
bn |
lim |
n→∞ |
2n−1 |
3n−1 |
lim |
n→∞ |
2−
| ||
3−
|
2 |
3 |
2 |
3 |