题目内容
用简便方法算
×(
+18)
×
+
÷
.
| 5 |
| 9 |
| 9 |
| 5 |
| 5 |
| 9 |
| 5 |
| 6 |
| 4 |
| 9 |
| 6 |
| 5 |
分析:(1)运用乘法分配律简算;
(2)把除法改为乘法,运用乘法分配律简算.
(2)把除法改为乘法,运用乘法分配律简算.
解答:解:(1)
×(
+18)
=
×
+
×18
=1+10
=11;
(2)
×
+
÷
=
×
+
×
=(
+
)×
=1×
=
.
| 5 |
| 9 |
| 9 |
| 5 |
=
| 5 |
| 9 |
| 9 |
| 5 |
| 5 |
| 9 |
=1+10
=11;
(2)
| 5 |
| 9 |
| 5 |
| 6 |
| 4 |
| 9 |
| 6 |
| 5 |
=
| 5 |
| 9 |
| 5 |
| 6 |
| 4 |
| 9 |
| 5 |
| 6 |
=(
| 5 |
| 9 |
| 4 |
| 9 |
| 5 |
| 6 |
=1×
| 5 |
| 6 |
=
| 5 |
| 6 |
点评:认真分析数据,选择合适的简便方法进行简算.
练习册系列答案
相关题目