3 |
b1 |
32 |
2b2 |
33 |
3b3 |
3n |
nbn |
n |
n+1 |
3(n+1) |
n |
3(n+1) |
n |
3(n+1) |
n |
3×2 |
1 |
3×3 |
2 |
3×4 |
3 |
3(n+1) |
n |
1 |
2 |
3 |
2 |
n |
2 |
1 |
4 |
3 |
4 |
3n |
bn |
1 |
n+1 |
1 |
n |
3n |
nbn |
1 |
n(n+1) |
3 |
b1 |
32 |
2b2 |
33 |
3b3 |
3n |
nbn |
1 |
1×2 |
1 |
2×3 |
1 |
3×4 |
1 |
n(n+1) |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
n |
1 |
n+1 |
1 |
n+1 |
n |
n+1 |
1 | ||
2x+
|
A.
| B.2
| C.3
| D.4
|
1 |
a1a2 |
1 |
a2a3 |
1 |
anan+1 |
1 |
2 |
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