脱式计算（能简算的要简算）（23+14）+3412-（34-38）14+13+14+2357+14-91434+36-5897+18+38+5789-（89-715）34+37-3449+89-815．-数学
=
| 9 |
| 29 |
⑤
| 3 |
| 4 |
| 3 |
| 6 |
| 5 |
| 8 |
=
| 18 |
| 24 |
| 12 |
| 24 |
| 15 |
| 24 |
=
| 5 |
| 8 |
⑥
| 9 |
| 7 |
| 1 |
| 8 |
| 3 |
| 8 |
| 5 |
| 7 |
=（
| 9 |
| 7 |
| 5 |
| 7 |
| 1 |
| 8 |
| 3 |
| 8 |
=2
| 1 |
| 2 |
⑦
| 8 |
| 9 |
| 8 |
| 9 |
| 7 |
| 15 |
=
| 8 |
| 9 |
| 8 |
| 9 |
| 7 |
| 15 |
=
| 7 |
| 15 |
⑧
| 3 |
| 4 |
| 3 |
| 7 |
| 3 |
| 4 |
=
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 7 |
=
