计算下面各题，能简算的要简算．1-57×212549×5×18813÷7+17×61312×25+910÷920（12+23+34）×2429+12÷45+38．-数学
=
| 4 |
| 9 |
=40；
③
| 8 |
| 13 |
| 1 |
| 7 |
| 6 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 6 |
| 13 |
=
| 1 |
| 7 |
| 8 |
| 13 |
| 6 |
| 13 |
=
| 1 |
| 7 |
| 14 |
| 13 |
=
| 2 |
| 13 |
④
| 1 |
| 2 |
| 2 |
| 5 |
| 9 |
| 10 |
| 9 |
| 20 |
=
| 1 |
| 5 |
=2
| 1 |
| 5 |
⑤（
| 1 |
| 2 |
| 2 |
| 3 |
| 3 |
| 4 |
=
| 1 |
| 2 |
| 4 |
| 9 |
| 8 |
| 13 |
| 1 |
| 7 |
| 6 |
| 13 |
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 6 |
| 13 |
| 1 |
| 7 |
| 8 |
| 13 |
| 6 |
| 13 |
| 1 |
| 7 |
| 14 |
| 13 |
| 2 |
| 13 |
| 1 |
| 2 |
| 2 |
| 5 |
| 9 |
| 10 |
| 9 |
| 20 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 2 |
| 2 |
| 3 |
| 3 |
| 4 |
| 1 |
| 2 |
