问题描述: 9.81*0.1+98.1*0.5+981*0.49的简便运算 1个回答 分类:数学 2014-11-01 问题解答: 我来补答 9.81*0.1+98.1*0.5+981*0.49=0.981*1+0.981*50+0.981*490=0.981*(1+50+490)=0.981*541=530.721 展开全文阅读