（1）(258-147)÷[(3112+4.375)÷1989]（2）[113×(4112-2.625)-412]÷335（3）2-613÷926-23+1835÷0.6×23（4）[213+(5.4-223)×123]÷689．-数学
| 1 |
| 12 |
| 3 |
| 8 |
| 8 |
| 9 |
=
| 59 |
| 56 |
| 179 |
| 24 |
| 179 |
| 9 |
=
| 59 |
| 56 |
| 3 |
| 8 |
=
| 59 |
| 21 |
（2）1
| 1 |
| 3 |
| 1 |
| 12 |
| 1 |
| 2 |
=
| 4 |
| 3 |
| 1 |
| 12 |
| 5 |
| 8 |
| 1 |
| 2 |
=
| 4 |
| 3 |
| 35 |
| 24 |
| 1 |
| 2 |
=1
| 17 |
| 18 |
| 1 |
| 2 |
=-2
| 5 |
| 9 |
（3）2-
| 6 |
| 13 |
| 9 |
| 26 |
