1/2X1/3-1/3X1/4-1/4X1/5-1/5X1/6.-1/39X1/40
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/06 01:35:22
![1/2X1/3-1/3X1/4-1/4X1/5-1/5X1/6.-1/39X1/40](/uploads/image/z/14769424-64-4.jpg?t=1%2F2X1%2F3-1%2F3X1%2F4-1%2F4X1%2F5-1%2F5X1%2F6.-1%2F39X1%2F40)
1/2X1/3-1/3X1/4-1/4X1/5-1/5X1/6.-1/39X1/40
1/2X1/3-1/3X1/4-1/4X1/5-1/5X1/6.-1/39X1/40
1/2X1/3-1/3X1/4-1/4X1/5-1/5X1/6.-1/39X1/40
1/2X1/3=1/2--1/3
1/3X1/4=1/3--1/4
.
依次类推最后结果=1/2--1/140=69/140
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