题目内容
脱式计算：
3.6-3.6÷0.9×0.8
÷
+87.25×
（
+
）×（
-
）
7.8÷[32×（1-
）+3.6]
（4.2+
）÷[（21.74-
）×
]．
3.6-3.6÷0.9×0.8
| 51 |
| 4 |
| 4 |
| 3 |
| 3 |
| 4 |
（
| 22 |
| 9 |
| 1 |
| 3 |
| 23 |
| 6 |
| 53 |
| 16 |
7.8÷[32×（1-
| 5 |
| 8 |
（4.2+
| 9 |
| 4 |
| 6 |
| 25 |
| 2 |
| 3 |
（1）3.6-3.6÷0.9×0.8
=3.6-4×0.8，
=3.6-3.2，
=0.4；
（2）
÷
+87.25×
=12.75×
+87.25×
，
=（12.75+87.25）×
，
=100×
，
=75；
（3）7.8÷[32×（1-
）+3.6]
=7.8÷[32×
+3.6]，
=7.8÷[12+3.6]，
=7.8÷15.6，
=0.5；
（4）（4.2+
）÷[（21.74-
）×
]
=（
+
）÷[（21.74-0.24）×
]，
=
÷[
×
]，
=
×
，
=
．
=3.6-4×0.8，
=3.6-3.2，
=0.4；
（2）
| 51 |
| 4 |
| 4 |
| 3 |
| 3 |
| 4 |
=12.75×
| 3 |
| 4 |
| 3 |
| 4 |
=（12.75+87.25）×
| 3 |
| 4 |
=100×
| 3 |
| 4 |
=75；
（3）7.8÷[32×（1-
| 5 |
| 8 |
=7.8÷[32×
| 3 |
| 8 |
=7.8÷[12+3.6]，
=7.8÷15.6，
=0.5；
（4）（4.2+
| 9 |
| 4 |
| 6 |
| 25 |
| 2 |
| 3 |
=（
| 21 |
| 5 |
| 9 |
| 4 |
| 2 |
| 3 |
=
| 129 |
| 20 |
| 43 |
| 2 |
| 2 |
| 3 |
=
| 129 |
| 20 |
| 3 |
| 43 |
=
| 9 |
| 20 |
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