1 |
2x |
1 |
2x |
C | 0n |
1 |
4 |
C | 2n |
C | 1n |
1 |
2 |
n(n-1) |
8 |
C | r8 |
1 |
2 |
C | r8 |
1 |
2 |
C | 28 |
1 |
2 |
1 |
4 |
bn |
an |
1 |
n+1 |
1 |
an |
1 |
c1 |
1 |
c2 |
1 |
c3 |
1 |
cn |
5n |
2n+1 |
1 |
anan+1 |
A.
| B.
| C.1 | D.
|
an |
2an+1 |
A.13 | B.
| C.11 | D.
|
A.8 | B.9 | C.8或9 | D.7 |
Sn |
Tn |
7n+1 |
4n+27 |
A.4:3 | B.3:2 | C.7:4 | D.78:71 |
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