1 |
2 |
1 |
1×2 |
1 |
1 |
1 |
2 |
1 |
6 |
1 |
2×3 |
1 |
2 |
1 |
3 |
1 |
12 |
1 |
3×4 |
1 |
3 |
1 |
4 |
1 |
20 |
1 |
4×5 |
1 |
4 |
1 |
5 |
1 |
56 |
1 |
72 |
1 |
(a+1)(a+2) |
1 |
(a+2)(a+3) |
1 |
(a+3)(a+4) |
1 |
56 |
1 |
7×8 |
1 |
7 |
1 |
8 |
1 |
72 |
1 |
8×9 |
1 |
8 |
1 |
9 |
1 |
n(n+1) |
1 |
n |
1 |
n+1 |
1 |
(a+1)(a+2) |
1 |
(a+2)(a+3) |
1 |
(a+3)(a+4) |
1 |
a+1 |
1 |
a+2 |
1 |
a+2 |
1 |
a+3 |
1 |
a+3 |
1 |
a+4 |
1 |
a+1 |
1 |
a+4 |
3 |
(a+1)(a+4) |
1 |
7×8 |
1 |
7 |
1 |
8 |
1 |
8×9 |
1 |
8 |
1 |
9 |
1 |
n(n+1) |
1 |
n |
1 |
n+1 |
3x |
2y |
9x |
2y |
2y |
9x |
3 |
x+2 |
x2-1 |
x+2 |
x2-1 |
x-1 |
2x |
x3+2x2+x |
a2-1 |
a-1 |
x2-4x+4 |
x-2 |
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