题目内容

计算下面各题,能简便计算的用简便方法计算.
7.4×9.8-14.5         
13.4+5.62+17.6+4.386.73×4.8+5.2×6.73      
8.4÷0.6+8.4÷0.4(9.6+1.48÷3.7)÷8      5.8÷[4×(1.34-0.14)].

解:7.4×9.8-14.5,
=7.4×(10-0.2)-14.5,
=7.4×10-7.4×0.2-14.5,
=74-1.48-14.5,
=58.02;
13.4+5.62+17.6+4.38,
=(13.4+17.6)+(5.62+4.38),
=31+10,
=41;
6.73×4.8+5.2×6.73,
=6.73×(4.8+5.2),
=6.73×10,
=67.3;
8.4÷0.6+8.4÷0.4,
=84÷6+84÷4
=14+21
=35;
(9.6+1.48÷3.7)÷8,
=9.6÷8+1.48÷3.7÷8,
=1.2+0.05,
=1.25;
5.8÷[4×(1.34-0.14)],
=5.8÷(4×1.2),
=5.8÷4.8,
=1.2.
分析:利用乘法分配律、加法结合律、加分交换律得等进行解决问题.
点评:耐心细致的计算,按部就班的解决问题,是解决运算定律和小数四则运算关键.
练习册系列答案
相关题目

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网