1 |
4 |
1004 |
2009 |
1 |
x2 |
3 |
x |
A.1个 | B.2个 | C.3个 | D.4个 |
1 |
4 |
1 |
4 |
1 |
k |
1 |
k+1 |
1 |
k |
1 |
k+1 |
1 |
2 |
1 |
k |
1 |
k+1 |
1 |
2 |
1 |
k(k+1) |
1 |
2 |
1 |
k |
1 |
k+1 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
2008 |
1 |
2009 |
1 |
2 |
1 |
2009 |
1 |
2 |
2008 |
2009 |
1004 |
2009 |
1 |
x2 |
3 |
x |
1 |
x2 |
3 |
x |
9 |
4 |
9 |
4 |
1 |
x |
3 |
2 |
9 |
4 |
1 |
x |
3 |
2 |
2 |
3 |
9 |
4 |
2 |
x |
A.3 | B.
| C.-3 | D.-
|
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