1 |
4 |
an+1 |
an |
1 |
4 |
1 |
4 |
1 |
4 |
an+1 |
an |
1 |
4 |
1 |
4 |
1 |
4 |
1 |
4 |
1 |
4 |
1 |
4 |
1 |
4 |
1 |
4 |
1 |
4 |
1 |
4 |
1 |
4 |
1 |
4 |
1 |
4 |
1 |
4 |
1 |
4 |
1 |
4 |
1 |
4 |
1 |
4 |
1 |
4 |
n(1+3n-2) |
2 |
| ||||
1-
|
3n2-n |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
lnnx |
an2 |
A.(-∞,4] | B.(-∞,8] | C.[4,+∞) | D.[8,+∞) |
A.2 | B.
| C.
| D.4 |
1 |
2-an |
1 |
an-1 |
9 |
10 |
3 |
5 |
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