题目内容
计算:(
×
+
×
)×
=
.
| 23 |
| 5 |
| 31 |
| 7 |
| 25 |
| 7 |
| 23 |
| 5 |
| 1 |
| 8 |
| 23 |
| 5 |
| 23 |
| 5 |
分析:先把小括号里面的数运用乘法分配律简算;然后再运用乘法结合律简算.
解答:解:(
×
+
×
)×
,
=[
×(
+
)]×
,
=[
×8]×
,
=
×(8×
),
=
×1,
=
.
故答案为:
.
| 23 |
| 5 |
| 31 |
| 7 |
| 25 |
| 7 |
| 23 |
| 5 |
| 1 |
| 8 |
=[
| 23 |
| 5 |
| 31 |
| 7 |
| 25 |
| 7 |
| 1 |
| 8 |
=[
| 23 |
| 5 |
| 1 |
| 8 |
=
| 23 |
| 5 |
| 1 |
| 8 |
=
| 23 |
| 5 |
=
| 23 |
| 5 |
故答案为:
| 23 |
| 5 |
点评:运算定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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