| a+b |
| a2b-ab2 |
| 4 |
| a2-b2 |
| a2-2ab+b2 |
| a2b-ab2 |
| a+b |
| ab(a-b) |
| 4 |
| (a+b)(a-b) |
| (a-b)2 |
| ab(a-b) |
| (a+b)2-4ab |
| ab(a+b)(a-b) |
| (a-b)2 |
| ab(a-b) |
| (a-b)2 |
| ab(a+b)(a-b) |
| ab(a-b) |
| (a-b)2 |
| 1 |
| a+b |
| 1 |
| a+b |
| 3a |
| a-3 |
| a |
| a+3 |
| a2-9 |
| a |
| 1 |
| a |
| 1 |
| b |
| b |
| a+b |
| 2a |
| b |
| a |
| b |
| b |
| 2a |
| y |
| x |
| x |
| y |
| a+1 |
| a2-a |
| a |
| a2-2a+1 |
| 1 |
| a |
| 3 |
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