问题描述: 简便运算(78.6—0.786×25+75%×21.4)÷15×2001 1个回答 分类:数学 2014-10-26 问题解答: 我来补答 (78.6—0.786×25+75%×21.4)÷15×2001 =(78.6—78.6×0.25+75%×21.4)÷15×2001= (78.6×0.75+75%×21.4)÷15×2001 =(78.6+21.4)×0.75÷15×2001 =100×0.75÷15×2001=75÷15×2001=5×2001=10005 展开全文阅读