| a2-9 |
| a-1 |
| a2-6a+9 |
| a2-a |
| a2 |
| a-3 |
| 1 |
| a |
| A |
| x+2 |
| B |
| x-3 |
| 5x |
| (x+2)(x-3) |
| 2x |
| x-1 |
| 2 |
| x-1 |
| 12 |
| a2-9 |
| 2 |
| 3-a |
| b |
| a-b |
| a |
| a+b |
| 2ab |
| b2-a2 |
| 2x |
| x-3 |
| x |
| x+3 |
| x2-9 |
| x |
| 2 |
| x+3 |
| 2 |
| 3-x |
| 2x-18 |
| x2-9 |
| 1 |
| 1×3 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3×5 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 5×7 |
| 1 |
| 2 |
| 1 |
| 5 |
| 1 |
| 7 |
| 1 |
| 17×19 |
| 1 |
| 2 |
| 1 |
| 17 |
| 1 |
| 19 |
| 1 |
| 1×3 |
| 1 |
| 3×5 |
| 1 |
| 5×7 |
| 1 |
| 17×19 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 2 |
| 1 |
| 5 |
| 1 |
| 7 |
| 1 |
| 2 |
| 1 |
| 17 |
| 1 |
| 19 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 7 |
| 1 |
| 17 |
| 1 |
| 19 |
| 1 |
| 2 |
| 1 |
| 19 |
| 9 |
| 19 |
| 1 |
| 1×3 |
| 1 |
| 3×5 |
| 1 |
| 5×7 |
| 1 |
| 9×11 |
| 1 |
| 9×11 |
| 1 |
| (2n-1)(2n+1) |
| 1 |
| (2n-1)(2n+1) |
| 1 |
| (x-1)x |
| 1 |
| x(x+1) |
| 1 |
| (x+1)(x+2) |
| 1 |
| (x+2)(x+3) |
| x-3 |
| x2-3 |
| 3 |
| 3-x |
| x-3 |
| (x-3)(x+3) |
| 3 |
| x-3 |
| x-3 |
| (x-3)(x+3) |
| 3(x+3) |
| (x-3)(x+3) |
| 1 |
| b |
| 1 |
| c |
| 1 |
| a |
| 1 |
| c |
| 1 |
| a |
| 1 |
| b |