题目内容
怎样简便怎样算.
|
|
|
分析:(1)按照从左到右顺序计算,
(2)(3)运用乘法分配律解答.
(2)(3)运用乘法分配律解答.
解答:解:(1)
×
×
,
=
×
,
=
;
(2)
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(3)
×85,
=
×(86-1),
=
×86-
×1,
=3-
,
=2
.
| 5 |
| 12 |
| 7 |
| 25 |
| 3 |
| 14 |
=
| 7 |
| 60 |
| 3 |
| 14 |
=
| 1 |
| 40 |
(2)
| 5 |
| 6 |
| 1 |
| 4 |
| 5 |
| 6 |
| 3 |
| 4 |
=(
| 1 |
| 4 |
| 3 |
| 4 |
| 5 |
| 6 |
=1×
| 5 |
| 6 |
=
| 5 |
| 6 |
(3)
| 3 |
| 86 |
=
| 3 |
| 86 |
=
| 3 |
| 86 |
| 3 |
| 86 |
=3-
| 3 |
| 86 |
=2
| 83 |
| 86 |
点评:完成本题要注意分析式中数据,运用合适的简便方法计算,没简便算法的注意计算顺序.
练习册系列答案
相关题目