5.4×4.6+0.54×5.4的简便算法

分类: 作业答案 • 2022-04-03 11:17:37

问题描述：

答

5.4×4.6+0.54×5.4
=(5+0.4)×(5-0.4)+(5+0.4)×(5+0.4)/10
=25-0.16+(25+2×5×0.4+0.16)/10
=25-0.16+(25+4+0.16)/10
=25-0.16+2.9+0.016
=27.756
就这么简单哈