| 2a2+3a+2 |
| a+1 |
| a2−a−5 |
| a+2 |
| 3a2−4a−5 |
| a−2 |
| 2a2−8a+5 |
| a−3 |
=（2a+1）+
| 1 |
| a+1 |
| 1 |
| a+2 |
| 1 |
| a−2 |
| 1 |
| a−3 |
=[（2a+1）-（a-3）-（3a+2）+（2a-2）]+（
| 1 |
| a+1 |
| 1 |
| a+2 |
| 1 |
| a−2 |
| 1 |
| a−3 |
=
| 1 |
| a+1 |
| 1 |
| a+2 |
| 1 |
| a−2 |
| 1 |
| a−3 |
=
| 1 |
| (a+1)(a+2) |
| 1 |
| (a−2)(a−3) |
=
| −8a+4 |
| (a+1)(a+2)(a−2)(a−3) |
| 2a2+3a+2 |
| a+1 |
| a2−a−5 |
| a+2 |
| 3a2−4a−5 |
| a−2 |
| 2a2−8a+5 |
| a−3 |
| 2a2+3a+2 |
| a+1 |
| a2−a−5 |
| a+2 |
| 3a2−4a−5 |
| a−2 |
| 2a2−8a+5 |
| a−3 |
| 1 |
| a+1 |
| 1 |
| a+2 |
| 1 |
| a−2 |
| 1 |
| a−3 |
| 1 |
| a+1 |
| 1 |
| a+2 |
| 1 |
| a−2 |
| 1 |
| a−3 |
| 1 |
| a+1 |
| 1 |
| a+2 |
| 1 |
| a−2 |
| 1 |
| a−3 |
| 1 |
| (a+1)(a+2) |
| 1 |
| (a−2)(a−3) |
| −8a+4 |
| (a+1)(a+2)(a−2)(a−3) |