1 |
3 |
1 |
3 |
a1+a2+a3+…+an |
n |
1 |
5 |
1 |
3×5 |
1 |
15 |
1 |
14 |
1 |
5×7 |
1 |
35 |
1 |
27 |
1 |
7×9 |
1 |
63 |
1 |
44 |
1 |
9×11 |
1 |
99 |
1 |
3 |
1 |
15 |
1 |
35 |
1 |
63 |
1 |
99 |
1 |
(2n-1)(2n+1) |
1 |
(2k-1)(2k+1) |
a1+a2+a3+…+ak+ak+1 |
k+1 |
1 |
(2k-1)(2k+1) |
1 |
(2k+1)(2k+3) |
1 |
(2n-1)(2n+1) |
| ||
3 |
| ||
8 |
| ||
a+b |
| ||
24 |
2an |
A.an=1-(-1)n | B.an=1+(-1)n+1 | ||
C.an=2sin2
| D.an=(1-cosnπ)+(n-1)(n-2) |
A.有3个 | B.有2个 | C.有1个 | D.不存在 |
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