问题描述: 432.1乘以123.4-432.2乘以123.3(怎样简便计算) 1个回答 分类:数学 2014-12-11 问题解答: 我来补答 432.1×123.4-432.2×123.3=432.1×123.4-(432.1+0.1)×123.3=432.1×123.4-432.1×123.3-0.1×123.3=432.1×(123.4-123.3)-12.33=432.1×0.1-12.33=43.21-12.33=30.88 展开全文阅读