| 1 |
| b |
| 1 |
| c |
| 1 |
| a |
| b |
| a |
| b |
| a |
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| n(n+1) |
| 2011 |
| 2012 |
| x3+xy2+1 |
| x3+xy-x2y-y3 |
| x2y-xy2 |
| x3+xy2-x2y-y3 |
| x2y+xy2 |
| x3+x2y+xy2+y3 |
| x2y+y3+1 |
| x2y+y3-x3-xy2 |
| x3+y3 |
| x3+x2y+xy2+y3 |
| 1 |
| x(x+a) |
| 1 |
| (x+a)(x+2a) |
| 1 |
| (x+2a)(x+3a) |
| 1 |
| (x+3a)(x+4a) |
| b2-bc+c2 |
| a |
| a2 |
| b+c |
| 3 | ||||
|
| ||||||
|
| 1 |
| (x-1)(x-2) |
| 1 |
| (x-2)(x-3) |
| 1 |
| (x-n)(x-n-1) |