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一乘二分之一加二乘三分之一加三乘四分之一.加二千零四乘二千零五分之一 =(1-1/2)+(1/2-1/3)+(1/3-1/4)+...+(1/2004-1/2005) =1-1/2005) (中間數都減去) =2004/2005
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