题目内容
| 能简算的用简算. 25%×
|
12.9×60%+87.1×
| ||||||
101×
|
1.4-(1.5-80%×
|
分析:算式(1)可据乘法交换律及结合律计算;
算式(2)、(3)可据乘法分配律进行计算;
算式(4)根据四则混合运算的运算顺序计算即可.
算式(2)、(3)可据乘法分配律进行计算;
算式(4)根据四则混合运算的运算顺序计算即可.
解答:解:(1)25%×
×4,
=(0.25×4)×
,
=1×
,
=
;
(2)12.9×60%+87.1×
,
=12.9×
+87.1×
,
=(12.9+87.1)×
,
=100×
,
=60;
(3)101×
-
,
=(101-1)×
,
=100×
,
=8;
(4)1.4-(1.5-80%×
),
=1.4-(1.5-
×
),
=1.4-1,
=0.4.
| 11 |
| 23 |
=(0.25×4)×
| 11 |
| 23 |
=1×
| 11 |
| 23 |
=
| 11 |
| 23 |
(2)12.9×60%+87.1×
| 3 |
| 5 |
=12.9×
| 3 |
| 5 |
| 3 |
| 5 |
=(12.9+87.1)×
| 3 |
| 5 |
=100×
| 3 |
| 5 |
=60;
(3)101×
| 2 |
| 25 |
| 2 |
| 25 |
=(101-1)×
| 2 |
| 25 |
=100×
| 2 |
| 25 |
=8;
(4)1.4-(1.5-80%×
| 5 |
| 8 |
=1.4-(1.5-
| 4 |
| 5 |
| 5 |
| 8 |
=1.4-1,
=0.4.
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.
练习册系列答案
相关题目