题目内容
我会用简便方法计算.
×
+
×
+0.75×
-
.
| 3 |
| 4 |
| 1 |
| 5 |
| 3 |
| 4 |
| 2 |
| 5 |
| 3 |
| 5 |
| 3 |
| 4 |
分析:首先根据小数化成分数的方法,把0.75化成
,然后运用乘法分配律进行简算.
| 3 |
| 4 |
解答:解:
×
+
×
+0.75×
-
,
=
×
+
×
+
×
-
,
=
×(
+
+
-1),
=
×
,
=
;
| 3 |
| 4 |
| 1 |
| 5 |
| 3 |
| 4 |
| 2 |
| 5 |
| 3 |
| 5 |
| 3 |
| 4 |
=
| 3 |
| 4 |
| 1 |
| 5 |
| 3 |
| 4 |
| 2 |
| 5 |
| 3 |
| 4 |
| 3 |
| 5 |
| 3 |
| 4 |
=
| 3 |
| 4 |
| 1 |
| 5 |
| 2 |
| 5 |
| 3 |
| 5 |
=
| 3 |
| 4 |
| 1 |
| 5 |
=
| 3 |
| 20 |
点评:此题考查的目的是理解掌握整数乘法的分配律,并且能够灵活运用乘法分配律对分数四则混合运算进行简便计算.
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