1 |
3 |
1 |
an |
1 |
nbn |
3 |
4 |
1 |
n+2 |
1 |
a1 |
1 |
an |
1 |
an-1 |
an-1-an |
an•an-1 |
1 |
nbn |
1 |
n(n+2) |
1 |
1•3 |
1 |
2•4 |
1 |
3•5 |
1 |
n(n+2) |
1 |
2 |
1 |
3 |
1 |
2 |
1 |
4 |
1 |
3 |
1 |
5 |
1 |
n |
1 |
n+2 |
1 |
2 |
3 |
2 |
1 |
n+1 |
1 |
n+2 |
1 |
2 |
3 |
2 |
2n+3 |
(n+1)(n+2) |
2n+3 |
(n+1)(n+2) |
2n+2 |
(n+1)(n+2) |
2 |
n+2 |
2n+2 |
(n+1)(n+2) |
2 |
n+2 |
1 |
2 |
3 |
2 |
2n+3 |
(n+1)(n+2) |
1 |
2 |
3 |
2 |
2 |
n+2 |
3 |
4 |
1 |
n+2 |
3 |
4 |
1 |
n+2 |
f(1) |
g(1) |
f(-1) |
g(-1) |
5 |
2 |
f(n) |
g(n) |
15 |
16 |
A.
| B.
| C.
| D.
|
A.91 | B.152 | C.218 | D.279 |
2 |
3 |
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