|1-1/2|+|1/2-1/3|+|1/3-1/4|+...|1/9-1/10|
来源：学生作业帮助网 编辑：六六作业网 时间：2024/11/28 15:26:09
|1-1/2|+|1/2-1/3|+|1/3-1/4|+...|1/9-1/10||1-1/2|+|1/2-1/3|+|1/3-1/4|+...|1/9-1/10||1-1/2|+|1/2-1/3|+
|1-1/2|+|1/2-1/3|+|1/3-1/4|+...|1/9-1/10|
|1-1/2|+|1/2-1/3|+|1/3-1/4|+...|1/9-1/10|
|1-1/2|+|1/2-1/3|+|1/3-1/4|+...|1/9-1/10|
1-1/2+1/2-1/3+1/3-1/4+...1/9-1/10=1-1/10=9/10