1 |
Sn |
Sn |
2n+1 |
1 |
4 |
1 |
Sn |
1 |
Sn-1 |
1 |
S1 |
1 |
Sn |
1 |
Sn |
1 |
2n-1 |
Sn |
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 |
1 |
2 |
1 |
2n+1 |
n |
2n+1 |
x |
2x+1 |
1 |
(2x+1)2 |
1 |
3 |
1 |
4 |
1 |
4 |
1 |
3 |
1 |
4 |
28 |
3 |
a1+a2+a3+…+an |
n |
A.2n+1 | B.2n-1 | C.2n-3 | D.2n-5 |
© 2017-2019 超级试练试题库,All Rights Reserved.