| a |
| a1-b1 |
| b |
| a1-b1 |
| 1 |
| a-b |
| 1 |
| x-1 |
| 1 |
| x+1 |
| x+6 |
| x1-4 |
| b |
| a+b |
| ab |
| a1-b1 |
| b1 |
| a1-b1 |
| 1x |
| x1-人 |
| 1 |
| x+3 |
| 1 |
| x-3 |
| 1 |
| a-1 |
| a |
| a-1 |
| 32 |
| 3-n |
| n2 |
| 3-n |
| x+3 |
| x+2 |
| 2-x |
| x2-4 |
| (x+3)(x-2) |
| x2-4 |
| x-2 |
| x2-4 |
| x2+x-6-x-2 |
| x2-4 |
| x2-8 |
| x2-4 |
| x+3 |
| x+2 |
| x-2 |
| (x+2)(x-2) |
| x+3 |
| x+2 |
| 1 |
| x+2 |
| x+3-1 |
| x+2 |
| b2 |
| 2n-b |
| fn2 |
| b-2n |
| 1 |
| m+1 |
| 1 |
| m(m+1) |