| 3 |
| x |
| x-y |
| 6 |
| 2 |
| 1-a |
| b |
| 1-π |
| 2 |
| x2+1 |
| x-y |
| π+1 |
| (x-y)2 |
| x-y |
| a-b八 |
| 4 |
| 1 |
| x |
| 1 |
| x |
| x+1 |
| 23 |
| 1 |
| 4 |
| x2-1 |
| x-1 |
| 1 |
| a |
| x-3 |
| 4 |
| 4x |
| π |
| 1 |
| x |
| x(x-1) |
| x |
| 5 |
| x |
| 1 |
| 2 |
| x |
| 5 |
| x |
| π |
| 1 |
| 5 |
| a+b |
| 2c |
| b+1 |
| a |
| x-1 |
| x2-1 |
| 2 |
| x |
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 5+a |
| m-n |
| 5 |
| 4-y | ||
|
| x |
| y |
| m |
| n |
| a |
| b |
| 2a |
| 3b |
| x-y |
| x |
| x |
| x2-y2 |
| 4 |
| x |
| 2 |
| x |
| x |
| 5 |
| 1 |
| a+b |
| y |
| x+3y |
| m-n |
| 10 |
| m+6 |
| m |