4 |
7 |
9 |
7 |
7 |
7 |
2 |
3 |
4 |
7 |
9 |
7 |
7 |
7 |
2 |
3 |
2 |
3 |
2 |
3 |
2 |
3 |
2 |
3 |
2 |
3 |
6 |
2 |
y1 |
2 |
y2 |
2 |
y3 |
2 |
y2007 |
1 |
2 |
1 |
3 |
1 |
10 |
1 |
15 |
1 |
26 |
1 |
35 |
A.
| B.
| C.
| D.
|
1 |
1×2 |
1 |
2 |
1 |
2×3 |
1 |
2 |
1 |
3 |
1 |
3×4 |
1 |
3 |
1 |
4 |
1 |
n(n+1) |
1 |
1×2 |
1 |
2×3 |
1 |
n(n+1) |
1 |
1×3 |
1 |
3×5 |
1 |
5×7 |
1 |
7×9 |
1 |
9×11 |
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