问题描述: [ 1/2-(3/4-3/5]÷7/10 27.4-52.8÷(1.9+2·1) 9.25*9·9+0·925能简算吗? 1个回答 分类:数学 2014-09-26 问题解答: 我来补答 [1/2-(3/4-3/5)]÷7/10=[1/2-(15/20-12/20)]×10/7=(1/2-3/20)×10/7=(10/20-3/20)×10/7=7/20×10/7=1/227.4-52.8÷(1.9+2.1)=27.4-52.8÷4=27.4-13.2=14.29.25×9.9+0.925=9.25×9.9+9.25×0.1=9.25×(9.9+0.1)=9.25×10=92.5 展开全文阅读