| 20002001 |
| 20012000 |
| 20012000 |
| 20022000 |
| 20002001 |
| 20012000 |
| 20012000 |
| 20022000 |
| (20002000+1)×20022000-200120002 |
| 20012000×20022000 |
| 20002000×20022000+20022000-200120002 |
| 20012000×20022000 |
| (20012000-10000)(20012000+10000)+20022000-200120002 |
| 20012000×20022000 |
| -100002+20022000 |
| 20012000×20022000 |
| -79978000 |
| 20012000×20022000 |