题目：
计算：①2
| 5 |
| 80 |
| 20 |
| 45 |
②(
| 27 |
| 48) |
| 3 |
答案
解：①2| 5 |
| 80 |
| 20 |
| 45 |
=2
| 5 |
| 5 |
| 5 |
| 5 |
=0；
②(
| 27 |
| 48) |
| 3 |
=（3
| 3 |
| 3 |
| 3 |
=-
| 3 |
| 3 |
=-3．
解：①2
| 5 |
| 80 |
| 20 |
| 45 |
=2
| 5 |
| 5 |
| 5 |
| 5 |
=0；
②(
| 27 |
| 48) |
| 3 |
=（3
| 3 |
| 3 |
| 3 |
=-
| 3 |
| 3 |
=-3．
| 5 |
| 80 |
| 20 |
| 45 |
| 27 |
| 48) |
| 3 |
| 5 |
| 80 |
| 20 |
| 45 |
| 5 |
| 5 |
| 5 |
| 5 |
| 27 |
| 48) |
| 3 |
| 3 |
| 3 |
| 3 |
| 3 |
| 3 |
| 5 |
| 80 |
| 20 |
| 45 |
| 5 |
| 5 |
| 5 |
| 5 |
| 27 |
| 48) |
| 3 |
| 3 |
| 3 |
| 3 |
| 3 |
| 3 |
