13又4/19+86又15/19×0.25+0.625×86又15/19×0.125姐姐哥哥,快做

来源：学生作业学帮网编辑：学帮网时间：2024/06/16 13:53:40

13又4/19+86又15/19×0.25+0.625×86又15/19×0.125
姐姐哥哥,快做

13又4/19+86又15/19×0.25+0.625×86又15/19+86又15/19×0.125
=13又4/19+86又15/19[0.25+0.625+0.125]
=13又4/19+86又15/19×1
=[13+86]+[4/19+15/19]
=99+1
=100

100