| 0.3x+2 |
| 0.5x-1 |
| 3x+20 |
| 5x-10 |
| 3x+20 |
| 5x-10 |
| 3y |
| x-y |
| 2x |
| x-y |
| () |
| x2-y2 |
| b+c |
| -a |
| -(b+c) |
| a |
| -z |
| -x2y |
| z |
| x2y |
| 1-x |
| x-y |
| x-1 |
| x-y |
| 2x-3y |
| 3x-2y |
| 3x-2y |
| 2y-3x |
| x左-左x+1 |
| x左-1 |
| x-1 |
| A |
| a+b |
| ab |
| () |
| a2b |
| x |
| x(x-1) |
| 1 |
| () |
| 3a |
| a-b |
| () |
| a2-b2 |
| m2n+mn2 |
| 2m2n2 |
| () |
| 2mn |
| (x-1)(x+1)+1 |
| x3+5x |
| x |
| x2+5 |
| -2 |
| 3x |
| 2 |
| 3x |
| 2 |
| 3x |
| -2 |
| -ab |
| 2 |
| ab |
| 2 |
| ab |
| -5-y |
| -x |
| 5+y |
| x |
| 5+y |
| x |
| x+2 |
| x-1 |
| x2+3x+2 |
| x2-1 |