| 4(a+b)2 |
| 2(a+b)(a−b) |
| 3b(a−b) |
| 2(a+b)(a−b) |
| ab+7b2 |
| 2a2−2b2 |
| 4(a+2b)(a+b) |
| 2(a+b)(a−b) |
| 2a+4b |
| a−b |
当a=
| 49 |
| 4 |
| 31 |
| 4 |
| 13 |
| 40 |
| 2(a+b) |
| a−b |
| 3b |
| 2a+2b |
| ab+7b2 |
| 2a2−2b2 |
| 49 |
| 4 |
| 31 |
| 4 |
| 4(a+b)2 |
| 2(a+b)(a−b) |
| 3b(a−b) |
| 2(a+b)(a−b) |
| ab+7b2 |
| 2a2−2b2 |
| 4(a+2b)(a+b) |
| 2(a+b)(a−b) |
| 2a+4b |
| a−b |
| 49 |
| 4 |
| 31 |
| 4 |
| 13 |
| 40 |