54×(1/23-1/31)+23×(1/31+1/54)+31×(1/23-1/54)

来源:学生作业学帮网 编辑:学帮网 时间:2024/06/05 07:29:40

54×(1/23-1/31)+23×(1/31+1/54)+31×(1/23-1/54)

原式=54/23-54/31+23/31+23/54-31/23+31/54
=(54-31)/23-(54-23)/31+(23+31)/54
=1-1+1
=1