脱式计算，能简算的要简算：（1）34+2917+14+3817；（2）23+(45-23)×53；（3）(512+19+38)×72；（4）817÷23+123×917+123；（5）（12+13）÷35-1718；（6）3-3.79+9.7-6.21．-数学
| 8 |
| 17 |
=（
| 3 |
| 4 |
| 1 |
| 4 |
| 9 |
| 17 |
| 8 |
| 17 |
=1+6，
=7；
（2）
| 2 |
| 3 |
| 4 |
| 5 |
| 2 |
| 3 |
| 5 |
| 3 |
=
| 2 |
| 3 |
| 2 |
| 15 |
| 5 |
| 3 |
=
| 2 |
| 3 |
| 2 |
| 9 |
=
| 8 |
| 9 |
（3）(
| 5 |
| 12 |
| 1 |
| 9 |
| 3 |
| 8 |
=
| 5 |
| 12 |
| 1 |
| 9 |
| 3 |
| 8 |
=30+8+27，
=38+27，
=65；
（4）
| 8 |
| 17 |
| 1 |
| 23 |
| 9 |
| 17 |
