| a-1 |
| 1 |
| 1×2 |
| 1 |
| 1 |
| 1 |
| 2 |
| 1 |
| 2×3 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3×4 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| ab |
| 1 |
| (a+1)(b+1) |
| 1 |
| (a+2)(b+2) |
| 1 |
| (a+2010)(b+2010) |
| x2-2x+1 |
| x2-1 |
| x-1 |
| x2+x |
| a2 |
| a-b |
| b2 |
| b-a |
| a+b |
| ab |
| l-a |
| ca-4 |
| 5 |
| a-c |
| x-4 |
| xc-1 |
| xc-lx-4 |
| xc+cx+1 |
| 1 |
| x-1 |
| x-4 |
| x-3 |
| x2-4 |
| x-3 |
| y |
| x |
| x |
| y |
| 3 |
| 3-2x2-4x |
| x2+2x-1 |
| x |
| 3 |
| z |
| 2 |
| xy+yz+zx |
| x2-3y2+4z2 |
| 1 |
| 2 |
| 1 |
| 2 |
| |a|-1 |
| |a+1| |
| p3+q3 |
| p3-q3 |
| s+t |
| s2t+st2 |