题目内容
[5-3
÷(1
+2.25×
)]÷0.125.
| 7 |
| 8 |
| 5 |
| 6 |
| 1 |
| 3 |
分析:本题可将算式中的小数化为分数后,根据乘法分配律进行巧算即可.
解答:解:[5-3
÷(1
+2.25×
)]÷0.125
=[5-
÷(
+
×
)]×8,
=5×8-
×8÷(
+
×
),
=40-31÷(
+
),
=40-31÷
,
=40-12,
=28.
| 7 |
| 8 |
| 5 |
| 6 |
| 1 |
| 3 |
=[5-
| 31 |
| 8 |
| 11 |
| 6 |
| 9 |
| 4 |
| 1 |
| 3 |
=5×8-
| 31 |
| 8 |
| 11 |
| 6 |
| 9 |
| 4 |
| 1 |
| 3 |
=40-31÷(
| 11 |
| 6 |
| 3 |
| 4 |
=40-31÷
| 31 |
| 12 |
=40-12,
=28.
点评:完成此类问题要认真分析式中数据的特点及内在联系,然后运用合适的方法进行计算.
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