题目内容
用简便的方法计算. 5.48+8.73+4.52+1.27 |
0.4×1.25×25×8 | ||||||
17.5-4.25-5.75 | 276×
| ||||||
9.25×9.9+92.5% |
|
分析:(1)根据加法交换律和结合律进行简算;
(2)根据乘法交换律和结合律进行简算;
(3)根据减法的性质进行简算;
(4)根据乘法交换律进行简算;
(5)(6)根据乘法分配律进行简算.
(2)根据乘法交换律和结合律进行简算;
(3)根据减法的性质进行简算;
(4)根据乘法交换律进行简算;
(5)(6)根据乘法分配律进行简算.
解答:解:(1)5.48+8.73+4.52+1.27,
=(5.48+4.52)+(8.73+1.27),
=10+10,
=20;
(2)0.4×1.25×25×8,
=(0.4×25)×(1.25×8),
=10×10,
=100;
(3)17.5-4.25-5.75,
=17.5-(4.25+5.75),
=17.5-10,
=7.5;
(4)276×
÷27.6,
=276÷27.6×
,
=10×
,
=
;
(5)9.25×9.9+92.5%,
=0.925×99+0.925,
=0.925×(99+1),
=0.925×100,
=92.5;
(6)
×
+
÷75%,
=
×
+
×
,
=
×(
+
),
=
.
=(5.48+4.52)+(8.73+1.27),
=10+10,
=20;
(2)0.4×1.25×25×8,
=(0.4×25)×(1.25×8),
=10×10,
=100;
(3)17.5-4.25-5.75,
=17.5-(4.25+5.75),
=17.5-10,
=7.5;
(4)276×
2 |
7 |
=276÷27.6×
2 |
7 |
=10×
2 |
7 |
=
20 |
7 |
(5)9.25×9.9+92.5%,
=0.925×99+0.925,
=0.925×(99+1),
=0.925×100,
=92.5;
(6)
4 |
3 |
2 |
7 |
5 |
7 |
=
4 |
3 |
2 |
7 |
5 |
7 |
4 |
3 |
=
4 |
3 |
2 |
7 |
5 |
7 |
=
4 |
3 |
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.
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