| 2 |
| a+1 |
| a-2 |
| a2-1 |
| a2-2a |
| a2-2a+1 |
| 1 |
| 2 |
| 1 |
| 2 |
| 2 |
| 3 |
| 2 |
| 3 |
| 3 |
| 4 |
| 3 |
| 4 |
| n |
| n+1 |
| n |
| n+1 |
| n |
| n+1 |
| n |
| n+1 |
| 2012 |
| 2013 |
| 2012 |
| 2013 |
| 2012 |
| 2013 |
| x2+得 |
| x-4 |
| x3+x |
| x2-34 |
| a |
| a2-b2 |
| 得 |
| a+b |
| a+b |
| 5ab |
| 15a2b |
| a2-b2 |
| 5x+3y |
| x2-y2 |
| 2x |
| x2-y2 |
| 2x |
| x2-4 |
| 1 |
| x-2 |
| a |
| a-1 |
| a2-a |
| a2-1 |
| 1 |
| a-1 |
| -a |
| b |
| 2a2 |
| 5b |
| a |
| 5b |
| m+2n |
| n-m |
| n |
| m-n |
| 2m |
| n-m |
| 2x |
| 5x-3 |
| 3 | ||
25
|
| x |
| 5x+3 |
| ||
| -cd3 |
| 2a |
| d3 |
| c |
| 2a |
| gx+1 |
| 1-x |
| x |
| 1-xg |
| xg-1 |
| xg+6x+9 |
| xg+7x+1g |
| x+1 |
| x2-3x |
| x2-6x+9 |
| x2-11x+30 |
| x2-5x |
| 3 |
| x-3 |
| x |
| x-3 |
| y |
| 少x2 |
| y2 |
| 4x |