an-1 |
can-1+1 |
1 |
an |
2 |
3 |
4
| ||
4
|
an-1 |
can-1+1 |
1 |
an |
1 |
an-1 |
1 |
an |
1 |
a1 |
1 |
an |
1 |
nc+1-c |
1 |
1+c |
1 |
1+4c |
1 |
1+c |
1 |
1+4c |
1 |
2n-1 |
2 |
3 |
1 |
(2n-3)(2n+1) |
1 |
4 |
1 |
2n-3 |
1 |
2n+1 |
2 |
3 |
2 |
3 |
1 |
4 |
1 |
5 |
1 |
3 |
1 |
7 |
1 |
5 |
1 |
9 |
1 |
2n-3 |
1 |
2n+1 |
2 |
3 |
1 |
4 |
1 |
3 |
1 |
2n-1 |
1 |
2n+1 |
n |
4n2-1 |
4n2-n-1 |
4n2-1 |
4n2-n |
4n2-1 |
A.10 | B.15 | C.20 | D.40 |
1 |
4 |
an+1 |
an |
1 |
4 |
1 |
4 |
lnnx |
an2 |
A.(-∞,4] | B.(-∞,8] | C.[4,+∞) | D.[8,+∞) |
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