题干
已知数列
,
,...,
,通过计算得S1=
, S2=
, S3=
, 由此可猜测Sn＝____.
| 1 |
| 1 |
| 2 |
| 1 |
| 2 |
| 3 |
| 1 |
| n |
| ( |
| n |
| + |
| 1 |
| ) |
| 1 |
| 2 |
| 2 |
| 3 |
| 3 |
| 4 |
答案(点此获取答案解析）
| n |
| n |
| + |
| 1 |
