54×(1/23-1/31)+23×(1/31+1/54)+31×(1/23-1/54)
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/04 14:00:38
![54×(1/23-1/31)+23×(1/31+1/54)+31×(1/23-1/54)](/uploads/image/z/15063916-4-6.jpg?t=54%C3%97%EF%BC%881%2F23-1%2F31%EF%BC%89%2B23%C3%97%EF%BC%881%2F31%2B1%2F54%EF%BC%89%2B31%C3%97%EF%BC%881%2F23-1%2F54%EF%BC%89)
54×(1/23-1/31)+23×(1/31+1/54)+31×(1/23-1/54)
54×(1/23-1/31)+23×(1/31+1/54)+31×(1/23-1/54)
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