问题描述: 用简便方法计算.①3.5%×9.9 ②4.62+9.9③7.25×1.8+27.5×0.18. 1个回答 分类:数学 2014-10-21 问题解答: 我来补答 ①3.5%×9.9=0.035×(10-0.1)=0.035×10-0.035×1=0.35-0.035=0.315 ②4.62+9.9=4.62+10-0.1=14.62-0.1=14.52③7.25×1.8+27.5×0.18=7.25×1.8+2.75×1.8=(7.25+2.75)×1.8=10×1.8=18 展开全文阅读