an+1 |
an |
an |
an+1 |
a |
q |
a |
q |
2 |
q |
2 |
q |
2 |
q |
2 |
q |
1 |
2 |
1 |
2 |
an+1 |
an |
an |
an+1 |
n+1 |
n |
n |
n+1 |
1 |
n |
1 |
n+1 |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
n |
1 |
n+1 |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
n |
1 |
n+1 |
1 |
n+1 |
n |
n+1 |
n |
n+1 |
1 | ||
|
1 |
4 |
1 |
2 |
a3+a4 |
a4+a5 |
A.
| B.
| C.
| D.
|
A.4 | B.5 | C.6 | D.7 |
A.9 | B.15 | C.9或15 | D.24 |
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