题目内容
| 4 |
| 5 |
| 15 |
| 2 |
分析:先把0.25化成分数,然后再运用乘法分配律简算.
解答:解:
×(
+0.25),
=
×(
+
),
=
×
+
×
,
=6+
,
=6
.
| 4 |
| 5 |
| 15 |
| 2 |
=
| 4 |
| 5 |
| 15 |
| 2 |
| 1 |
| 4 |
=
| 4 |
| 5 |
| 15 |
| 2 |
| 4 |
| 5 |
| 1 |
| 4 |
=6+
| 1 |
| 5 |
=6
| 1 |
| 5 |
点评:乘法分配律是常用的简便运算的方法,要熟练掌握,灵活运用.
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