an-1 |
an |
an-1+1 |
1-an |
1 |
an |
an-1 |
an |
an-1+1 |
1-an |
1 |
an |
1 |
a n-1 |
1 |
an |
1 |
a1 |
1 |
an |
1 |
2n-1 |
1 |
(2n-1)(2n+1) |
1 |
2 |
1 |
2n-1 |
1 |
2n+1 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
5 |
1 |
2n-1 |
1 |
2n+1 |
n |
2n+1 |
n |
2n+1 |
(3n-1)×4n+1+4 |
3 |
(3n-1)×4n+1+4 |
9 |
|
A.15 | B.18 | C.9 | D.12 |
3 |
2 |
1 |
bn |
© 2017-2019 超级试练试题库,All Rights Reserved.