4 |
9an+12 |
1 |
n |
2 |
n |
n |
n |
a2 |
(a2-4)(a3-4) |
a3 |
(a3-4)(a4-4) |
an |
(an-4)(an+1-4) |
1 |
256 |
1 |
4n2-3n |
4 |
4×9n+12 |
1 |
9n+3 |
1 |
3 |
an |
(an-4)(an+1-4) |
4×9n-1 |
(4×9n-1-4)(4×9n-4) |
9n-1 |
4(9n-1-1)(9n-1) |
1 |
32 |
1 |
9n-1-1 |
1 |
9n-1 |
1 |
2 |
4 |
4×9n+12 |
1 |
9n+3 |
1 |
9n+3 |
1 |
91-n+3 |
1 |
9n+3 |
9n |
9+3×9n |
1 |
3 |
1 |
n |
2 |
n |
n |
n |
n |
n |
n-1 |
n |
1 |
n |
n |
n |
1 |
n |
n-1 |
n |
n-1 |
n |
1 |
n |
n |
n |
n+1 |
6 |
1 |
n |
2 |
n |
n |
n |
n+1 |
6 |
an |
(an-4)(an+1-4) |
4×9n-1 |
(4×9n-1-4)(4×9n-4) |
9n-1 |
4(9n-1-1)(9n-1) |
1 |
32 |
1 |
9n-1-1 |
1 |
9n-1 |
1 |
32 |
1 |
9-1 |
1 |
92-1 |
1 |
92-1 |
1 |
93-1 |
1 |
9n-1-1 |
1 |
9n-1 |
1 |
32 |
1 |
8 |
1 |
9n-1 |
C | 1 n |
C | 2 n |
n(n-1) |
2 |
a2 |
(a2-4)(a3-4) |
a3 |
(a3-4)(a4-4) |
an |
(an-4)(an+1-4) |
1 |
256 |
1 |
4n2-3n |
科目:高中数学 来源: 题型:
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