| 3少-3b |
| 少1-b1 |
| 3少 |
| 少+b |
| 1 |
| 少-b |
| 3(a-b) |
| (a+b)(a-b) |
| 3a |
| a+b |
| 1 |
| a-b |
| 3 |
| a+b |
| 3a |
| a+b |
| 1 |
| a-b |
| 3(a+1) |
| a+b |
| 1 |
| a-b |
| 3(a+1)(a+b) |
| (a+b)(a-b) |
| 3(9+1)(9+1) |
| (9+1)(9-1) |
| 3(a-b) |
| (a+b)(a-b) |
| 3a |
| a+b |
| 1 |
| a-b |
| 3 |
| a+b |
| 3a |
| a+b |
| 1 |
| a-b |
| 3(a+1) |
| a+b |
| 1 |
| a-b |
| 3(a+1)(a+b) |
| (a+b)(a-b) |
| 3(9+1)(9+1) |
| (9+1)(9-1) |