a | 2n+1 |
a | 2n |
1 |
4 |
1 |
a1a2 |
1 |
a2a3 |
1 |
anan+1 |
A.2-
| B.1-
| C.4-
| D.2-
|
1 |
4 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
1+n |
2 |
1 |
anan+1 |
4 |
(n+1)(n+2) |
1 |
n+1 |
1 |
n+2 |
1 |
a1a2 |
1 |
a2a3 |
1 |
anan+1 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
n+1 |
1 |
n+2 |
1 |
2 |
1 |
n+2 |
2 |
3 |
1 |
2 |
1 |
2n |
bn |
an |
a | 2n |
s | ni=2 |
a | 2i |
1 |
2 |
s | ni=2 |
a | 2i |
1 |
4 |
S4 |
S2 |
5 |
4 |
1 |
a1 |
1 |
a2 |
1 |
a3 |
1 |
a4 |
1 |
an |
A.2[1-(-2)n] | B.2(1-2n) | C.
| D.
|
1 | ||
2x+
|
1 |
4x+2 |
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