题目内容
计算:
÷
+
×
.
| 4 |
| 15 |
| 9 |
| 5 |
| 11 |
| 15 |
| 5 |
| 9 |
分析:先把除法变成乘法,再运用乘法分配律简算.
解答:解:
÷
+
×
,
=
×
+
×
,
=
×(
+
),
=
×1,
=
.
| 4 |
| 15 |
| 9 |
| 5 |
| 11 |
| 15 |
| 5 |
| 9 |
=
| 4 |
| 15 |
| 5 |
| 9 |
| 11 |
| 15 |
| 5 |
| 9 |
=
| 5 |
| 9 |
| 4 |
| 15 |
| 11 |
| 15 |
=
| 5 |
| 9 |
=
| 5 |
| 9 |
点评:乘法分配律是最常用的简便运算的方法,要熟练掌握,灵活运用.
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