8 |
5 |
15 |
7 |
24 |
9 |
3 |
3 |
8 |
5 |
15 |
7 |
24 |
9 |
進(jìn)而可得寫(xiě)成 ?
(1+1)2?1 |
2×1+1 |
(2+1)2?1 |
2×2+1 |
(3+1)2?1 |
2×3+1 |
(4+1)2?1 |
2×4+1 |
故一個(gè)通項(xiàng)公式為:an=(?1)n
(n+1)2?1 |
2n+1 |
故答案為:an=(?1)n
(n+1)2?1 |
2n+1 |
8 |
5 |
15 |
7 |
24 |
9 |
8 |
5 |
15 |
7 |
24 |
9 |
3 |
3 |
8 |
5 |
15 |
7 |
24 |
9 |
(1+1)2?1 |
2×1+1 |
(2+1)2?1 |
2×2+1 |
(3+1)2?1 |
2×3+1 |
(4+1)2?1 |
2×4+1 |
(n+1)2?1 |
2n+1 |
(n+1)2?1 |
2n+1 |