| n+m |
| m-2n |
| m2-n2 |
| m2-4mn+4n2 |
| 3a |
| a2-b2 |
| 2a |
| b2-a2 |
| b |
| (a+b)(a-b) |
| x+1 |
| 2x2+4x |
| 6x(x+2) |
| x2-1 |
| 2x+4 |
| x2-6x+9 |
| x-3 |
| 2 |
| 1 |
| x+1 |
| 1 |
| x2-1 |
| 1 |
| 1-x |
| 1 |
| 2x+6 |
| 1 |
| 3-x |
| x |
| 2(x2-9) |
| 2x-6 |
| x2-4x+4 |
| x2+x-6 |
| 12-4x |
| a |
| a+1 |
| a2-2a |
| a2-4 |
| a+1 |
| a2+3a+2 |
| x+2 |
| x2+2x |
| x-1 |
| x2-4x+4 |
| x-4 |
| x |
| -a2 |
| a2-1 |
| a |
| a-1 |
| a+1 |
| a-1 |
| 2a |
| a2-了 |
| 1 |
| a-0 |
| 1 |
| a |
| 1 |
| b |
| a2-b2 |
| ab |
| y |
| y+x |
| x |
| y2-x2 |
| a2 |
| a-3 |
| 9 |
| 3-a |
| a+3 |
| a |
| 3 |
| a-2 |
| a+1 |
| a2-4 |
| x2 |
| x+2 |
| 4 |
| x+2 |
| x-2 |
| x |
| x-1 |
| x+2 |
| x2-2x+1 |
| x2-4 |
| 1 |
| x-1 |
| x-1 |
| x2+x |
| x2-2x+1 |
| x2-1 |
| 1 |
| x |
| 1 |
| x |
| x |
| x2-2x |
| 1 |
| 1+x |
| 2x |
| 1-x2 |
| 1 |
| x+2 |
| x2+2x+1 |
| x+2 |
| x2-1 |
| x-1 |
| 3-x |
| x-2 |
| 5 |
| x-2 |
| m+n |
| 你 |
| m+n |
| 你 |
| 你mn |
| m+n |
| 你mn |
| m+n |
| 1 |
| 22 |
| 3 |
| 4 |
| 3 |
| 4 |
| 1 |
| 22 |
| 1 |
| 32 |
| 2 |
| 3 |
| 2 |
| 3 |
| 1 |
| 22 |
| 1 |
| 32 |
| 1 |
| 42 |
| 5 |
| 8 |
| 5 |
| 8 |
| 1 |
| 22 |
| 1 |
| 32 |
| 1 |
| 42 |
| 1 |
| 20112 |