1+
|
1+
|
1+
|
1+
|
1+
|
|
|
|
n2+n+1 |
n(n+1) |
1 |
n(n+1) |
1 |
1×2 |
1 |
2×3 |
1 |
3×4 |
1 |
2000×2001 |
1 |
1×2 |
1 |
2×3 |
1 |
3×4 |
1 |
2000×2001 |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
2000 |
1 |
2001 |
1 |
2001 |
8 |
|
-a3 |
-
|
a2 |
-a |
1 |
a |
-a |
-a |
-a |
|
9a |
| ||
2-
|
45 |
|
2 |
3 |
2
|
1 | ||||
|
1 | ||
|
1 | ||
|
12 |
27 |
A.9
| B.6
| C.9
| D.6
|
27 |
8 |
|
18 |
2 |
b |
ab2 |
6a |
b2 |
|
2 |
3 |
a3b |
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