计算下面各题，注意使用简便算法．（1）29+12÷45+38（2）[1-（14+38）]÷14（3）2-613÷926-23（4）813÷7+17×613．-数学
| 3 |
| 8 |
=
| 2 |
| 9 |
=1
| 2 |
| 9 |
（2）[1-（
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
=[1-
| 5 |
| 8 |
| 1 |
| 4 |
=
| 3 |
| 8 |
| 1 |
| 4 |
=
| 3 |
| 2 |
（3）2-
| 6 |
| 13 |
| 9 |
| 26 |
| 2 |
| 3 |
=2-
| 4 |
| 3 |
| 2 |
| 3 |
=2-（
| 4 |
| 3 |
| 2 |
| 3 |
=2-2，
=0；
（4）
| 8 |
| 13 |
| 1 |
| 7 |
| 6 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 3 |
| 8 |
| 2 |
| 9 |
| 2 |
| 9 |
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
| 5 |
| 8 |
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
| 3 |
| 2 |
| 6 |
| 13 |
| 9 |
| 26 |
| 2 |
| 3 |
| 4 |
| 3 |
| 2 |
| 3 |
| 4 |
| 3 |
| 2 |
| 3 |
| 8 |
| 13 |
| 1 |
| 7 |
| 6 |
| 13 |
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
