| 2 |
| 2 |
| x |
| x2-1 |
| x2-x |
| ||
| 2 |
| ||
| 2 |
| x |
| x2+x+1 |
| 1 |
| 2 |
| x2 |
| x4+x2+1 |
| a |
| b |
| a2+ab-b2 |
| a2-2ab+2b2 |
| x-2 |
| x2+2x+1 |
| 2x+2 |
| x2+2x+1 |
| 1 |
| x-1 |
| (x-y)(z-x) |
| (x-2y+z)(x+y-2z) |
| (z-y)(x-y) |
| (x+y-2z)(y+z-2x) |
| (x-z)(y-z) |
| (y+z-2x)(x-2y+z) |
| a+b+c |
| abc |
| 5x2+2y2-z2 |
| 2x2-3y2-10z2 |
| a-1 |
| 1 |
| ab |
| 1 |
| (a+1)(b+1) |
| 1 |
| (a+2)(b+2) |
| 1 |
| (a+2004)(b+2004) |
| a2x-a-2x |
| ax-a-x |
| 1 |
| ab |
| 1 |
| (a+1)(b+1) |
| 1 |
| (a+2)(b+2) |
| 1 |
| (a+2008)(b+2008) |