2n+1 |
n(n+1) |
1 |
n(n+1) |
A.
| B.
| C.
| D.
|
3 |
2 |
1 |
2 |
3 |
2 |
1 |
2 |
3 |
2 |
1 |
2 |
(a-b)2 |
(a+b)2-4ab |
1 |
2 |
1 |
2 |
5 |
6 |
1 |
6 |
1 |
6 |
1 |
2 |
1 |
3 |
7 |
12 |
1 |
12 |
1 |
12 |
1 |
3 |
1 |
4 |
4023 |
2011×2012 |
1 |
2011 |
1 |
2012 |
1 |
2011 |
1 |
2012 |
1 |
2011 |
1 |
2012 |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
2011 |
1 |
2012 |
1 |
2012 |
2011 |
2012 |
1-
|
a-
|
A.0 | B.1 | C.2 | D.3 |
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