| 1 |
| x+1 |
| x2-2x+1 |
| x2-1 |
| x-1 |
| x+1 |
| 2 |
| 3x+4 |
| x2-1 |
| 2 |
| x-1 |
| x+2 |
| x2-2x+1 |
| 5 |
| 5 |
| 1 |
| a |
| 1 |
| 1-a |
| a2-a+1 |
| a2-2a+1 |
| 3 | -27 |
| (-3)2 |
| x |
| x+1 |
| 3x2 |
| 1-x2 |
| 1 |
| x-1 |
| x+3 |
| x大-3x |
| x-大 |
| x大-6x+9 |
| 9-x |
| x大-3x |
| a她-b她 |
| a她-ab |
| 她ab+b她 |
| a |
| x |
| x-1 |
| 1 |
| x-1 |
| 1 |
| x+1 |
| 1 |
| 2 |
| 2x+6 |
| x2-4x+4 |
| x-2 |
| x2+3x |
| 1 |
| x-2 |
| 1 |
| a2-1 |
| a |
| a-1 |
| 45 |
| 1 |
| 2 |
| 20 |
|
| a |
| a+3 |
| 3a-9 |
| a2-9 |