题目内容
| 4 |
| 5 |
| 5 |
| 6 |
| 5 |
| 9 |
分析:运用乘法分配律简算.
解答:解:
×(
+
),
=
×
+
×
,
=
+
,
=
.
| 4 |
| 5 |
| 5 |
| 6 |
| 5 |
| 9 |
=
| 4 |
| 5 |
| 5 |
| 6 |
| 4 |
| 5 |
| 5 |
| 9 |
=
| 2 |
| 3 |
| 4 |
| 9 |
=
| 10 |
| 9 |
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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题目内容
| 4 |
| 5 |
| 5 |
| 6 |
| 5 |
| 9 |
| 4 |
| 5 |
| 5 |
| 6 |
| 5 |
| 9 |
| 4 |
| 5 |
| 5 |
| 6 |
| 4 |
| 5 |
| 5 |
| 9 |
| 2 |
| 3 |
| 4 |
| 9 |
| 10 |
| 9 |