4/5+4/45+4/117+4/221+4/357+4/525=简便
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![4/5+4/45+4/117+4/221+4/357+4/525=简便](/uploads/image/z/8620237-37-7.jpg?t=4%2F5%2B4%2F45%2B4%2F117%2B4%2F221%2B4%2F357%2B4%2F525%3D%E7%AE%80%E4%BE%BF)
4/5+4/45+4/117+4/221+4/357+4/525=简便
4/5+4/45+4/117+4/221+4/357+4/525=简便
4/5+4/45+4/117+4/221+4/357+4/525=简便
4/5+4/45+4/117+4/221+4/357+4/525=4[1/(1*5)+1/(5*9)+1/(9*13)+1/(13*17)+……+1/(21*25)] =1-1/5+1/5-1/9+1/9-1/13+1/13-1/17+……+1/21-1/25=1-1/25=24/25.请点击下面的“采纳答案”按钮,送咱一朵小红花鼓励下吧!