| lim |
| n→∞ |
| 1 |
| 1•4 |
| 1 |
| 4•7 |
| 1 |
| 7•10 |
| 1 |
| (3n−2)(3n+1) |
=
| lim |
| n→∞ |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 7 |
| 1 |
| 3n−2 |
| 1 |
| 3n+1 |
=
| lim |
| n→∞ |
| 1 |
| 3 |
| 1 |
| 3n+1 |
=
| lim |
| n→∞ |
| 1 |
| 3 |
| 3n |
| 3n+1 |
| 1 |
| 3 |
故答案为
| 1 |
| 3 |
| lim |
| n→∞ |
| 1 |
| 1•4 |
| 1 |
| 4•7 |
| 1 |
| 7•10 |
| 1 |
| (3n−2)(3n+1) |
| lim |
| n→∞ |
| 1 |
| 1•4 |
| 1 |
| 4•7 |
| 1 |
| 7•10 |
| 1 |
| (3n−2)(3n+1) |
| lim |
| n→∞ |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 7 |
| 1 |
| 3n−2 |
| 1 |
| 3n+1 |
| lim |
| n→∞ |
| 1 |
| 3 |
| 1 |
| 3n+1 |
| lim |
| n→∞ |
| 1 |
| 3 |
| 3n |
| 3n+1 |
| 1 |
| 3 |
| 1 |
| 3 |