计算下面各题，能简算的要简算．①12+15-14②43-18+712③29+45+79+15④23-56+13⑤2-27-57⑥58-(58-12)⑦29+(34-12)⑧910-(25+14)．-数学
| 1 |
| 5 |
=
| 1 |
| 4 |
| 1 |
| 5 |
=
| 1 |
| 20 |
②
| 4 |
| 3 |
| 1 |
| 8 |
| 7 |
| 12 |
=（
| 4 |
| 3 |
| 7 |
| 12 |
| 1 |
| 8 |
=
| 23 |
| 12 |
| 1 |
| 8 |
=
| 43 |
| 24 |
=1
| 19 |
| 24 |
③
| 2 |
| 9 |
| 4 |
| 5 |
| 7 |
| 9 |
| 1 |
| 5 |
=（
| 2 |
| 9 |
| 7 |
| 9 |
| 4 |
| 5 |
| 1 |
| 5 |
=1+1，
=2；
④
| 2 |
| 3 |
| 5 |
| 6 |
| 1 |
| 3 |
=（
| 2 |
| 3 |
| 1 |
| 3 |
| 5 |
| 6 |
=1-
| 5 |
| 6 |
=
| 1 |
| 6 |
⑤2-
