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×÷27.6 |
9.25×9.9+92.5% | ×+÷75% |
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%,
=×+×,
=×(+),
=.
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.
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.
=(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%,
=×+×,
=×(+),
=.
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.
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