| 1 |
| a |
| 1 |
| b |
| a-2ab-b |
| 2a-2b+7ab |
| -m3n |
| (m-n)2 |
| n2-mn |
| m |
| mn-n2 |
| m |
| x |
| x+4 |
| x+3 |
| x-4 |
| x2-2x+4 |
| x2+4x+3 |
| 3 |
| 2 |
| 1 |
| x-1 |
| x2+4x+3 |
| x-1 |
| 3 |
| 1 |
| x |
| 得 |
| 2 |
| 得x+x2+2 |
| 8x-3x2+42 |
| 0xy0 |
| x+y |
| xy3 |
| x0-y0 |
| 1 |
| 0(x-y) |
| 1 |
| 0 |
| 0 |
| 3 |
| x0-4x |
| x+3 |
| 4-x |
| x |
| x2-4x+4 |
| 2x-4 |
| 5 |
| 4 |
| x-3 |
| x-1 |
| x2-3x |
| 3 |
| x2 |
| x-1 |
| 2x |
| 1-x |
| 2 |
| x-1 |
| 1 |
| a2-4a+4 |
| a |
| a2-4 |
| 1 |
| 2a+4 |
| 2 |
| a+1 |
| 1 |
| a-1 |
| a |
| a2-1 |
| a+2 |
| 1-a2 |
| 2 |
| a+1 |
| a |
| 1-a |
| 3 |
| x2+4 |
| x |
| x2-4 |
| x2+2x |
| 1 |
| x+3 |
| x2-4 |
| x2+3x |
| x-2 |
| x2-1 |
| 2x+2 |
| x2+2x+1 |
| 1 |
| x-1 |
| 2 |
| x2 |
| x-2 |
| 4 |
| 2-x |
| 1 |
| x2+2x |
| 2 |
| 1 |
| a-b |
| 1 |
| b+a |
| ab |
| a+b |
| 2 |
| 2 |
| x2+4x+4 |
| x+2 |
| 2 |