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初中数学竞赛，证明1/2^2+1/3^2+……+1/n^2＜1，方法很巧妙
初中数学竞赛，证明1/2^2+1/3^2+……+1/n^2＜1，分数裂项太有用了
初中数学中考竞赛经典例题——代数部分182/465
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