1/5+1/45+1/117+1/221+1/357+1/525=?
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![1/5+1/45+1/117+1/221+1/357+1/525=?](/uploads/image/z/6917581-37-1.jpg?t=1%2F5%2B1%2F45%2B1%2F117%2B1%2F221%2B1%2F357%2B1%2F525%3D%3F)
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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