| 1999 |
| 2000 |
| 1 |
| 2000 |
=1999÷(
| 1999×2000+1999 |
| 2000 |
| 1 |
| 2000 |
=1999÷
| 1999×(2000+1) |
| 2000 |
| 1 |
| 2000 |
=1999×
| 2000 |
| 1999×2001 |
| 1 |
| 2000 |
=
| 2000 |
| 2001 |
| 1 |
| 2000 |
=1-
| 1 |
| 2001 |
| 1 |
| 2000 |
=1+
| 1 |
| 2000 |
| 1 |
| 2001 |
=1+
| 1 |
| 2000×2001 |
=
| 4002001 |
| 4002000 |
| 1999 |
| 2000 |
| 1 |
| 2000 |
| 1999 |
| 2000 |
| 1 |
| 2000 |
| 1999×2000+1999 |
| 2000 |
| 1 |
| 2000 |
| 1999×(2000+1) |
| 2000 |
| 1 |
| 2000 |
| 2000 |
| 1999×2001 |
| 1 |
| 2000 |
| 2000 |
| 2001 |
| 1 |
| 2000 |
| 1 |
| 2001 |
| 1 |
| 2000 |
| 1 |
| 2000 |
| 1 |
| 2001 |
| 1 |
| 2000×2001 |
| 4002001 |
| 4002000 |