x |
2008 |
2007 |
32 |
a2 |
33 |
a3 |
32008 |
a2008 |
x |
C | rn |
r |
2 |
r |
2 |
C | 2n |
1 |
2 |
3n |
an |
18 |
n(n-1) |
1 |
n-1 |
1 |
n |
32 |
a2 |
33 |
a3 |
32008 |
a2008 |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
2007 |
1 |
2008 |
1 |
2008 |
18×2007 |
2008 |
2008 |
2007 |
32 |
a2 |
33 |
a3 |
32008 |
a2008 |
3 | x |
1 | |||
2
|
x |
2 |
1 | |||
|
3 |
x2 |
1 |
x |
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