题目内容
怎样简便就怎样算.
|
36×(
|
| ||||||||||||||||
4-
|
(15-14×
|
|
分析:(1)(5)(6)依据四则运算计算方法:先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序计算,有括号先算括号里面的解答,
(2)(3)运用乘法分配律解答,
(4)运用减法性质解答.
(2)(3)运用乘法分配律解答,
(4)运用减法性质解答.
解答:解:(1)
×
÷
,
=
÷
,
=
;
(2)36×(
+
-
),
=36×
+36×
-36×
,
=24+6-27,
=30-27,
=3;
(3)
×58+42÷8,
=(58+42)×
,
=100×
,
=12.5;
(4)4-
-
,
=4-(
+
),
=4-1,
=3;
(5)(15-14×
)×
,
=(15-8)×
,
=7×
,
=2
;
(6)
÷
-
÷
,
=
-
,
=
.
| 4 |
| 9 |
| 1 |
| 5 |
| 4 |
| 5 |
=
| 4 |
| 45 |
| 4 |
| 5 |
=
| 1 |
| 9 |
(2)36×(
| 2 |
| 3 |
| 1 |
| 6 |
| 3 |
| 4 |
=36×
| 2 |
| 3 |
| 1 |
| 6 |
| 3 |
| 4 |
=24+6-27,
=30-27,
=3;
(3)
| 1 |
| 8 |
=(58+42)×
| 1 |
| 8 |
=100×
| 1 |
| 8 |
=12.5;
(4)4-
| 5 |
| 11 |
| 6 |
| 11 |
=4-(
| 5 |
| 11 |
| 6 |
| 11 |
=4-1,
=3;
(5)(15-14×
| 4 |
| 7 |
| 8 |
| 21 |
=(15-8)×
| 8 |
| 21 |
=7×
| 8 |
| 21 |
=2
| 2 |
| 3 |
(6)
| 4 |
| 5 |
| 5 |
| 8 |
| 1 |
| 2 |
| 5 |
| 8 |
=
| 32 |
| 25 |
| 4 |
| 5 |
=
| 12 |
| 25 |
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,注意计算结果的准确性.
练习册系列答案
相关题目