| 2005+2004×2006 |
| 2005×2005+2006×2006−3 |
=
| 2005+2004×(2005+1) |
| 20052+(2005+1)2−3 |
=
| 2005+2004×2005+2004 |
| 20052+20052+2×2005+1−3 |
=
| 2005×(2004+1)+2004 |
| 20052+20052+2004×2 |
=
| 20052+2004 |
| 2×(20052+2004) |
=
| 1 |
| 2 |
| 2005+2004×2006 |
| 2005×2005+2006×2006−3 |
| 2005+2004×2006 |
| 2005×2005+2006×2006−3 |
| 2005+2004×(2005+1) |
| 20052+(2005+1)2−3 |
| 2005+2004×2005+2004 |
| 20052+20052+2×2005+1−3 |
| 2005×(2004+1)+2004 |
| 20052+20052+2004×2 |
| 20052+2004 |
| 2×(20052+2004) |
| 1 |
| 2 |