问题描述: 3.8+2.2×(0.7×0.3)简便运算 1个回答 分类:数学 2014-11-25 问题解答: 我来补答 3.8+2.2×(0.7×0.3)=3.8+2.2*0.21=3.8+(2+0.2)*0.21=3.8+0.42+0.042=4.22+0.042=4.262 展开全文阅读