作业帮1/5+1/45+1/117+1/221+1/357+1/525=?
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/09 13:08:14
1/5+1/45+1/117+1/221+1/357+1/525=?
1/5+1/45+1/117+1/221+1/357+1/525=?
1/5+1/45+1/117+1/221+1/357+1/525=?
=1/5+(1/5-1/9)/4+(1/9-1/13)/4+.+(1/21-1/25)/4
=1/5+1/5/4-1/25/4
=6/25