x |
3n |
an |
x |
C | rn |
x |
C | 2n |
n(n-1) |
2 |
|
3n |
an |
3n | ||
3n-2•
|
18 |
n(n-1) |
1 |
n-1 |
1 |
n |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
98 |
1 |
99 |
1 |
99 |
196 |
11 |
229 |
11 |
|
229 |
11 |
A.2010 | B.4020 | C.3015 | D.-2010 |
A.6385 | B.5836 | C.3658 | D.8365 |
22+1 |
22-1 |
32+1 |
32-1 |
42+1 |
42-1 |
Sn |
n |
© 2017-2019 超级试练试题库,All Rights Reserved.