| 9 |
| 1 |
| 2 |
| 1 |
| 4 |
| 2a |
| a2-4 |
| 1 |
| 2-a |
| 1 |
| 2 |
| a2-1 |
| a2+4a+4 |
| a+1 |
| a+2 |
| x-2 |
| x+2 |
| x+2 |
| x-2 |
| x2-2x |
| x2 |
| x+2 |
| x2-2x |
| x-1 |
| x2-4x+4 |
| x-4 |
| x |
| 3 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 2a |
| a2-4 |
| 1 |
| 2-a |
| x |
| x-y |
| 2y |
| x-y |
| xy |
| x-2y |
| 1 |
| x |
| 1 |
| y |
| xg |
| x-1 |
| 4 |
| 1 |
| 3 |
| xg-yg |
| x |
| gxy-yg |
| x |
| 2 |
| xg-9 |
| 1 |
| x+3 |
| 3 |
| 2 |
| 1 |
| 2 |
| m+2n |
| n-m |
| n |
| m-n |
| 2n |
| n-m |
| a |
| a2-2a |
| 1 |
| 3-a |
| 2-a |
| 9-a2 |
| b6 |
| b |
| x |
| ax-xa+b |
| a-b |
| 1 |
| 3 |
| 3 |
| 2 |
| 3 |
| 3 |
6
|
| 3 | 3+
| ||
| 2 |
| 3 |
| 3 |
| (-4)2 |
| a+1 |
| a-1 |
| a |
| a2-2a+1 |
| 1 |
| a |
| 2 |
| 1 |
| 4 |
| 5 |
| 2 |
| 2x-3 |
| x |
| x2-9 |
| x |