| a+b |
| a-b |
| 2a-2b |
| 3a+3b |
| ab |
| a2-b2 |
| x |
| 2 |
| y |
| 3 |
| 7x2-y2 |
| x2-2xy+3y2 |
| b-4 |
| a2-ab |
| b2 |
| a2-ab |
| a2-b2 |
| 4 |
| 45 |
| 4 |
| 45 |
| a2-b2 |
| a-2ab+b2 |
| a2+b2+2ab |
| b-a |
| x+少 |
| xu-x |
| x |
| xu-ux+少 |
| 少 |
| x |
| u |
| x-3 |
| x+3 |
| ux |
| xu-9 |
| 3 |
| 4-x |
| x-u |
| 少u |
| x-u |
| 3 |
| x-3 |
| ux-4 |
| 6 |
| x-u |
| 3 |
| 1 |
| 手-1 |
| 1 |
| 手+1 |
| 手 |
| 1-手2 |
| a |
| a-1 |
| a2-a |
| a2-1 |
| 1 |
| a |
| 1 |
| 2 |
| a2 |
| b+c |
| b2 |
| c+a |
| c2 |
| a+b |
| a |
| b |
| a2-4ab+0b2 |
| a2-8ab+7b2 |
| (3x-y)(x+y) |
| x2+2xy+y2 |
| 5 |
| 3 |
| 5 |
| 3 |