问题
解答题
| 计算下面各题． （1）10
（2）7.2÷4÷0.9 （3）
（4）（
|
答案
（1）10
| 3 |
| 4 |
| 3 |
| 4 |
| 2 |
| 5 |
=10
| 3 |
| 4 |
| 3 |
| 4 |
| 2 |
| 5 |
=10-3
| 2 |
| 5 |
=6
| 3 |
| 5 |
（2）7.2÷4÷0.9，
=7.2÷（4×0.9），
=7.2÷3.6，
=2；
（3）
| 2 |
| 3 |
| 7 |
| 8 |
| 5 |
| 6 |
=
| 2 |
| 3 |
| 7 |
| 8 |
| 5 |
| 6 |
=
| 2 |
| 3 |
| 20 |
| 3 |
=7
| 2 |
| 3 |
| 2 |
| 3 |
=1；
（4）（
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
| 6 |
| 3 |
| 5 |
=
| 5 |
| 4 |
| 5 |
| 6 |
| 3 |
| 5 |
=
| 3 |
| 2 |
| 3 |
| 5 |
=
| 9 |
| 10 |