| 1 |
| u |
| 1 |
| v |
| 1 |
| f |
| uv |
| u+v |
| uv |
| u+v |
| 2x+1 |
| (x+1)(x+2) |
| A |
| x+1 |
| B |
| x+2 |
| a |
| a-2b |
| 2b |
| a-2b |
| a |
| b |
| b |
| a |
| a2-b2 |
| ab |
| 1 |
| R1 |
| 1 |
| R2 |
| 1 |
| R |
| R1R2 |
| R1+R2 |
| R1R2 |
| R1+R2 |
| 1 |
| x-1 |
| 3 |
| 1-x2 |
| 1 |
| a-2 |
| 4 |
| a2-4 |
| 1 |
| a+2 |
| 1 |
| a+2 |
| x |
| x0-x-0 |
| a |
| x+1 |
| b |
| x-0 |
| 1 |
| 3 |
| 1 |
| 3 |
| 0 |
| 3 |
| 0 |
| 3 |
| 6 |
| 6×3 |
| 6 |
| 3×5 |
| 6 |
| 5×7 |
| 6 |
| (2n-6)(2n+6) |
| n |
| 2n+6 |
| n |
| 2n+6 |
| 1 |
| 1+x |
| 1 |
| 2009 |
| 1 |
| 2008 |
| 1 |
| 2 |