2 |
3 |
2 |
3 |
A.最大项为0,最小项为-
| ||
B.最大项为0,最小项不存在 | ||
C.最大项不存在,最小项为-
| ||
D.最大项为0,最小项为a4 |
2 |
3 |
2 |
3 |
2 |
3 |
2 |
3 |
2 |
3 |
2 |
3 |
2 |
3 |
2 |
3 |
2 |
9 |
2 |
3 |
2 |
3 |
4 |
9 |
4 |
9 |
20 |
81 |
2 |
3 |
2 |
3 |
8 |
27 |
8 |
27 |
152 |
729 |
2 |
3 |
2 |
3 |
2 |
3 |
2 |
3 |
2 |
3 |
3n-1-2n |
3n |
20 |
81 |
A.68 | B.464 | C.468 | D.666 |
1 |
2 |
3 |
2 |
an |
2n-1 |
an |
an+1 |
an+1 |
an |
1 |
2 |
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