怎样算简便就怎样算．49×15÷45；（15-14×47）×821；45÷[（13+25）×411]；18×58+42÷8；72×58-32÷85；34×40%+0.75×35．-数学
=
| 1 |
| 9 |
（2）（15-14×
| 4 |
| 7 |
| 8 |
| 21 |
=（15-8）×
| 8 |
| 21 |
=7×
| 8 |
| 21 |
=
| 8 |
| 3 |
（3）
| 4 |
| 5 |
| 1 |
| 3 |
| 2 |
| 5 |
| 4 |
| 11 |
=
| 4 |
| 5 |
| 11 |
| 15 |
| 4 |
| 11 |
=
| 4 |
| 5 |
| 4 |
| 15 |
=
| 4 |
| 5 |
| 15 |
| 4 |
=3
（4）
| 1 |
| 8 |
=
| 1 |
| 8 |
| 1 |
| 8 |
=
| 1 |
| 8 |
=
| 1 |
| 8 |
=12.5
（5）
| 7 |
| 2 |
| 5 |
| 8 |
