| 1 |
| a |
| 1 |
| b |
| a-ab-b |
| 2a+ab-2b |
| 1 |
| a |
| 1 |
| b |
| -(a-b) |
| ab |
| a-ab-b |
| 2a+ab-2b |
| (a-b)-ab |
| 2(a-b)+ab |
| -3ab-ab |
| -6ab+ab |
| -4ab |
| -5ab |
| 4 |
| 5 |
| 4 |
| 5 |
| 3x |
| x-1 |
| x |
| x+1 |
| x2-1 |
| x |
| a2+b2 |
| ab |
| a2-b2 |
| a-b |
| 1 |
| 2 |
| 1 |
| a |
| 1 |
| b |
| 4 |
| a+b |
| b |
| a |
| a |
| b |
| 2a+2 |
| a-1 |
| a2-1 |
| a2-2a+1 |
| b |
| a |
| a |
| b |
| a2-3ab+b2 |
| a2-7ab-b2 |
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