| xy |
| x+y |
| x+2y |
| 3xy |
| b |
| a |
| ab |
| a() |
| ||
| a+b |
| () |
| ca+cb |
| 3a+3b |
| 1c |
| a+b |
| () |
| x-y |
| x+y |
| ( ) |
| x+y |
| -x+y |
| -( ) |
| 四.1a+gb |
| 四.4a+四.3b |
| a+g四b |
| 4a+3b |
| a+g四b |
| 4a+3b |
| 四.4m+四.gn | ||
|
| gm+n |
| m+n |
| gm+n |
| m+n |
| a-b |
| ab |
| () |
| a2b3 |
| xy |
| x3y-xy3 |
| 1 |
| () |
| 3x |
| x+y |
| ( ) |
| 5(x+y) |
| ( ) |
| ab |
| a2+ab |
| a2b |
| x2-9y2 |
| x2-3xy |
| x+3y |
| ( ) |
| 0.5x-1 |
| 0.3x+2 |
| 5x-10 |
| 3x+20 |
| 5x-10 |
| 3x+20 |