| 1 |
| x+1 |
| a+1 |
| a2-a |
| 4 |
| 1-a2 |
| a-1 |
| a2+2a+1 |
| x+1 |
| x |
| 1 |
| x |
| x |
| x2-y2 |
| y |
| y-x |
| x2-y2 |
| x-y |
| a2 |
| a+1 |
| 1 |
| a+1 |
| y-个 |
| y+个 |
| 2y |
| y2-5 |
| a+1 |
| a-1 |
| a2+a |
| a2-1 |
| x2-16 |
| x2+8x+16 |
| x |
| x+4 |
| b |
| a |
| x+2y |
| x2-y2 |
| y |
| y2-x2 |
| 2x |
| x2-y2 |
| x |
| x+2 |
| x |
| x-1 |
| 2x |
| x2-1 |
| x |
| x-1 |
| x-1 |
| x+2 |
| x2-2x+1 |
| x2-4 |
| 1 |
| x-1 |
c-
|
| 图 |
| c |
| c |
3-
|
| 图 |
| 3 |
| 3 |
4-
|
| 图 |
| 4 |
| 4 |
右-
|
| 图 |
| 右 |
| 右 |
| 2x-6 |
| 4-4x+x2 |
| x2+x-6 |
| 3-x |
| a2 |
| b |
| b2 |
| a |
| 1 |
| ab |
2+
| ||
2-
|
| ||||
|
| 3-x |
| 2x-4 |
| 5 |
| x-2 |
| 1 |
| x-1 |
| 1 |
| x+1 |
| 2a |
| a2-4 |
| 1 |
| 2-a |
| a2 |
| b |
| b2 |
| a |
| b |
| a |
| q-x |
| 2x-4 |
| 5 |
| x-2 |
| x |
| x-y |
| 2y |
| x-y |
| xy |
| x-2y |
| 1 |
| x |
| 1 |
| y |