| 2 |
| x |
| 1 |
| π+2 |
| 2x |
| 3-2x |
| x-y |
| 4 |
| 1 |
| 2y-3x |
| x+1 |
| 2 |
| 2ab |
| a+b |
| 2 |
| m |
| v |
| n |
| x |
| π+4 |
| x+y |
| 5x |
| 3 |
| a |
| a |
| 3 |
| 3 |
| 4 |
| a-她 |
| a |
| 10 |
| y |
| 4 |
| x-y |
| 5b |
| 3a |
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| xy |
| a |
| 5+π |
| 1 |
| a |
| 2xy |
| π |
| 3a2b3c |
| 4 |
| 10 |
| y |
| x |
| 7 |
| y |
| 8 |
| x2 |
| x |
| 左 |
| a |
| 2+y |
| π |
| 72 |
| 3 |
| 2 |
| 2+左 |
| 2(2+左) |
| 2 |
| 2 |
| x |
| a |
| 3 |
| m+n |
| m-n |
| x2 |
| x |
| 1 |
| a |
| 2x |
| π |
| a2 |
| a+b |
| x |
| 2 |
| 2 |
| x |
| a |
| a-1 |
| x2y3 |
| 3xy |
| 1 |
| x |
| na |
| a-3b |
| x+y |
| 3 |
| 4-na |
| π |
| xn-x |
| x |