| 1 |
| n+1 |
| 1 |
| n+2 |
| 1 |
| 2n |
| 13 |
| 24 |
A、增加了一項
| ||||||
B、增加了兩項
| ||||||
C、增加了兩項
| ||||||
D、增加了一項
|
| 1 |
| n+1 |
| 1 |
| n+2 |
| 1 |
| 2n |
| 13 |
| 24 |
| 1 |
| n+1 |
| 1 |
| 2n |
| 1 |
| k+1 |
| 1 |
| k+2 |
| 1 |
| k+k |
| 1 |
| (k+1)+1 |
| 1 |
| (k+1)+2 |
| 1 |
| (k+1)+(k+1) |
| 1 |
| k+1 |
| 1 |
| k+2 |
| 1 |
| k+k |
| 1 |
| k+1 |
| 1 |
| 2k+1 |
| 1 |
| 2k+2 |
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