1/5+1/45+1/117+1/221+1/357+1/525=?

来源：学生作业帮助网编辑：六六作业网时间：2024/11/25 05:31:02

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+1/45+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