1 |
2 |
3 |
4 |
5 |
8 |
7 |
16 |
2n−1 |
2n |
所以
1 |
2 |
1 |
4 |
3 |
8 |
5 |
16 |
2n−3 |
2n |
2n−1 |
2n+1 |
两式相减得:
1 |
2 |
1 |
2 |
2 |
4 |
2 |
8 |
2 |
16 |
2 |
2n |
2n−1 |
2n+1 |
1 |
2 |
| ||||
1−
|
2n−1 |
2n+1 |
则Sn=3−
2n+3 |
2n |
1 |
2 |
3 |
4 |
5 |
8 |
7 |
16 |
2n−1 |
2n |
1 |
2 |
3 |
4 |
5 |
8 |
7 |
16 |
2n−1 |
2n |
1 |
2 |
1 |
4 |
3 |
8 |
5 |
16 |
2n−3 |
2n |
2n−1 |
2n+1 |
1 |
2 |
1 |
2 |
2 |
4 |
2 |
8 |
2 |
16 |
2 |
2n |
2n−1 |
2n+1 |
1 |
2 |
| ||||
1−
|
2n−1 |
2n+1 |
2n+3 |
2n |