题目内容
(2012?泗县模拟)
×5.3-
+3.7×
.
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 8 |
分析:把算式
×5.3-
+3.7×
先改写成
×5.3-
×1+3.7×
,再逆用乘法分配律进行简算.
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 8 |
解答:解:
×5.3-
+3.7×
,
=
×5.3-
×1+3.7×
,
=
×(5.3-1+3.7),
=
×8,
=1.
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 8 |
=
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 8 |
=
| 1 |
| 8 |
=
| 1 |
| 8 |
=1.
点评:本题主要考查学生逆用乘法分配律进行简便计算的能力.
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