1 |
T2 |
1 |
T3 |
1 |
Tn |
1010 |
2013 |
n(1+2n-1) |
2 |
1 |
T2 |
1 |
T3 |
1 |
Tn |
1 |
22 |
1 |
32 |
1 |
n2 |
22-1 |
22 |
32-1 |
32 |
42-1 |
42 |
n2-1 |
n2 |
1•3•2•4•3•5•…•(n-1)(n+1) |
22•32•42•…•n2 |
n+1 |
2n |
n+1 |
2n |
1010 |
2013 |
4 |
7 |
1 |
1×3 |
1 |
3×5 |
1 |
(2n-1)(2n+1) |
•• |
18 |
•• |
18 |
A.960 | B.1920 | C.930 | D.1830 |
an |
n |
© 2017-2019 超级试练试题库,All Rights Reserved.