题目内容
用简便方法计算(写出主要过程).
|
(108+
|
分析:(1)运用乘法分配律简算;
(2)把除法改为乘法,进一步利用乘法分配律简算.
(2)把除法改为乘法,进一步利用乘法分配律简算.
解答:解:(1)
×
+
×
,
=
×(
+
),
=
×4,
=
;
(2)(108+
)÷9,
=(108+
)×
,
=108×
+
×
,
=12+
,
=12
.
| 5 |
| 8 |
| 9 |
| 4 |
| 5 |
| 8 |
| 7 |
| 4 |
=
| 5 |
| 8 |
| 9 |
| 4 |
| 7 |
| 4 |
=
| 5 |
| 8 |
=
| 5 |
| 2 |
(2)(108+
| 72 |
| 73 |
=(108+
| 72 |
| 73 |
| 1 |
| 9 |
=108×
| 1 |
| 9 |
| 72 |
| 73 |
| 1 |
| 9 |
=12+
| 8 |
| 73 |
=12
| 8 |
| 73 |
点评:完成此,注意分析式中数据,运用所学的运算定律进行简算.
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