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對f(x)求導 =mx^(m-1)+a 所以 m=2 a=1 f(x)=x^2+x 對其裂項 1/f(n)=1/(x^2+x )=[1/x-1/(x+1)] 則很容易算了S=(1-1/2+1/2-1/3'''''1/10-1/11) =10/11 打字累啊
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