题目内容
(
+
)×
=(
×
)+(
×
)
| 4 |
| 7 |
| 4 |
| 5 |
| 3 |
| 4 |
| 4 |
| 7 |
| 4 |
| 7 |
| 3 |
| 4 |
| 3 |
| 4 |
| 4 |
| 5 |
| 4 |
| 5 |
| 3 |
| 4 |
| 3 |
| 4 |
分析:(
+
)×
是两个数的和与一个数相乘,可以根据乘法分配律简算.
| 4 |
| 7 |
| 4 |
| 5 |
| 3 |
| 4 |
解答:解:(
+
)×
,
=(
×
)+(
×
),
=
+
,
=
.
故答案为:
,
,
,
.
| 4 |
| 7 |
| 4 |
| 5 |
| 3 |
| 4 |
=(
| 4 |
| 7 |
| 3 |
| 4 |
| 4 |
| 5 |
| 3 |
| 4 |
=
| 3 |
| 7 |
| 3 |
| 5 |
=
| 36 |
| 35 |
故答案为:
| 4 |
| 7 |
| 3 |
| 4 |
| 4 |
| 5 |
| 3 |
| 4 |
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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