| 2011a |
| (a−1)2 |
| a+1 |
| (a+1)(a−1) |
=
| 2011a |
| (a−1)2 |
| 1 |
| a−1 |
| a−1 |
| a−1 |
=
| 2011a |
| (a−1)2 |
| 1+a−1 |
| a−1 |
=
| 2011a |
| (a−1)2 |
| a |
| a−1 |
=
| 2011a |
| (a−1)2 |
| a−1 |
| a |
=
| 2011 |
| a−1 |
当a=2时，原式=
| 2011 |
| 2−1 |
| 2011a |
| a2−2a+1 |
| a+1 |
| a2−1 |
| 2011a |
| (a−1)2 |
| a+1 |
| (a+1)(a−1) |
| 2011a |
| (a−1)2 |
| 1 |
| a−1 |
| a−1 |
| a−1 |
| 2011a |
| (a−1)2 |
| 1+a−1 |
| a−1 |
| 2011a |
| (a−1)2 |
| a |
| a−1 |
| 2011a |
| (a−1)2 |
| a−1 |
| a |
| 2011 |
| a−1 |
| 2011 |
| 2−1 |