2 |
5 |
an |
an+1 |
4an+2 |
an+1+2 |
1 |
an |
1 |
an+1 |
1 |
an |
3 |
2 |
1 |
an |
5 |
2 |
3 |
2 |
1 |
an |
1 |
an |
3n+2 |
2 |
2 |
3n+2 |
2 |
3k+2 |
2 |
3(k+1)+2 |
4 |
9k2+21k+10 |
2 | ||
3•
|
3k2+7k+2 |
2 |
k(k+1) |
2 |
k(k+1) |
2 |
3 k2+7k+2 |
2 |
3k2+7k+2 |
2 |
5 |
11 |
17 |
23 |
29 |
5 |
A.19 | B.20 | C.21 | D.22 |
1 |
2 |
2 |
(n+1)n |
2 |
3 |
2 |
3 |
A.最大项为a1,最小项为a3 |
B.最大项为a1,最小项不存在 |
C.最大项为a1,最小项为a4 |
D.最大项不存在,最小项为a3 |
| ||
|
A.
| B.2 | C.
| D.
|
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