102.31×59 简便计算急

分类: 作业答案 • 2021-12-20 04:31:44

问题描述：

102.31×59 简便计算急

答

102.31X(60－1）＝102.31X60－102.31

答

102.31×60-102.31

答

(100+2.31)（60-1）=6000-100+（2+0.31）60-2.31
=5900+120+18.6-2.31
=6020+16.29
=6036.29

答

102.31×(60-1)=102.31×60-102.31=6036.29

答

102.31×59
=102.31×60-102.31
=6138.6-102.31
=6036.29

102.31×59 简便计算 急