作业帮 > 数学 > 作业

简便运算(78.6—0.786×25+75%×21.4)÷15×2001

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/07/16 19:14:31
简便运算(78.6—0.786×25+75%×21.4)÷15×2001
(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