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1+1/(1*2)+1/(2*3)+…+1/[(n-1)*n]>1+1/2^2+1/3^2+……+1/n^2 >1/(1*2)+1/(2*3)+…+1/[n*(n+1)]所以:1+1-1/n>1+1/2^2+1/3^2+……+1/n^2 >1-1/(n+1)放縮法是不等式證明中一種常用的方法,也是一種非常重要的方法….
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