1 |
22-1 |
1 |
32-1 |
1 |
42-1 |
1 |
(n+1)2-1 |
A.
| B.
| ||||||||||||||
C.
| D.
|
1 |
22-1 |
1 |
32-1 |
1 |
42-1 |
1 |
(n+1)2-1 |
1 |
(2+1)(2-1) |
1 |
(3+1)(3-1) |
1 |
(4+1)(4-1) |
1 |
(n+1+1)(n+1-1) |
1 |
3×1 |
1 |
4×2 |
1 |
5×3 |
1 |
(n+2)n |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
4 |
1 |
3 |
1 |
5 |
1 |
n |
1 |
n+2 |
1 |
2 |
1 |
4 |
1 |
3 |
1 |
5 |
1 |
n |
1 |
n+2 |
1 |
2 |
1 |
2 |
1 |
n+1 |
1 |
n+2 |
3 |
4 |
1 |
2 |
1 |
n+1 |
1 |
n+2 |
AnAn+1 |
j |
j |
1 |
2 |
1 |
22 |
1 |
2n-1 |
A.7 | B.8 | C.9 | D.10 |
1 |
4 |
(n-1)an |
n-an |
| ||||
|
|
an |
an+1-an |
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