| xy |
| x+y |
| yz |
| y+z |
| zx |
| z+x |
| 12 |
| 5 |
| 12 |
| 5 |
| a-2 |
| a+2 |
| a2-a |
| a2+4a+4 |
| a-4 |
| a+2 |
| 1 |
| a+2 |
| 1 |
| a+2 |
| a2b2c2 |
| a3+b3+c3 |
| 1 |
| a3 |
| 1 |
| b3 |
| 1 |
| c3 |
| x-4 |
| x-3 |
| x手-4 |
| x-3 |
| x手-她 |
| x手-手x+她 |
| x手-手x |
| x-手 |
| 手 |
| 3 |
| 8 |
| x+1 |
| x+3 |
| x+1 |
| a2+b2 |
| a2-b2 |
| a-b |
| a+b |
| 2ab |
| (a-b)(a+b)2 |
| x |
| (x-y)2 |
| x2-y2 |
| x+y |
| 2x+2 |
| x-y |
|
| 18x2 |
| 12x3 |
| 2 |
| x-1 |
| x+1 |
| 1-x |
| x2-4x |
| x2-8x+16 |
| 4 |
| 2-a |
| a |
| a-2 |
| 1 |
| da |
| 1 |
| a-7 |
| a-7 |
| da |
| d |
| d |