题目内容
用自己喜欢的方法计算.
|
|
分析:(1)运用乘法交换律简算;
(2)把除法变成乘法,运用乘法分配律简算.
(2)把除法变成乘法,运用乘法分配律简算.
解答:解:(1)
×
×
,
=
×
×
,
=
×
,
=
;
(2)
×
+
÷8,
=
×
+
×
,
=
×(
+
),
=
×
,
=
.
| 3 |
| 8 |
| 5 |
| 6 |
| 2 |
| 3 |
=
| 3 |
| 8 |
| 2 |
| 3 |
| 5 |
| 6 |
=
| 1 |
| 4 |
| 5 |
| 6 |
=
| 5 |
| 24 |
(2)
| 8 |
| 17 |
| 1 |
| 8 |
| 8 |
| 17 |
=
| 8 |
| 17 |
| 1 |
| 8 |
| 8 |
| 17 |
| 1 |
| 8 |
=
| 8 |
| 17 |
| 1 |
| 8 |
| 1 |
| 8 |
=
| 8 |
| 17 |
| 2 |
| 8 |
=
| 2 |
| 17 |
点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
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