(56+712+23)×481835×1920+225×1920-19204113×34+5114×45+6115×562001×199920001998÷19981998199912+16+112+120+130+142+156．-数学
=（2000+1）×
| 1999 |
| 2000 |
=2000×
| 1999 |
| 2000 |
| 1999 |
| 2000 |
=1999+
| 1999 |
| 2000 |
=1999
| 1999 |
| 2000 |
（5）1998÷1998
| 1998 |
| 1999 |
=19998÷
| 1999×1998+1998 |
| 1999 |
=1998×
| 1999 |
| (1999+1)×1998 |
=
| 1999 |
| 2000 |
（6）
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 20 |
| 1 |
| 30 |
| 1 |
| 42 |
| 1 |
| 56 |
=
| 1 |
| 1×2 |
| 1 |
| 2×3 |
| 1 |
| 3×4 |
| 2 |
| 4×5 |
| 1 |
| 5×6 |
| 1 |
| 6×7 |
| 1 |
| 7×8 |
=1-
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 7 |
| 1 |
| 8 |
=
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