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数列 a_n = 1 + (1)/(4) + (1)/(9) + ... + (1)/(n^2) (部分和)。最初の5項を書け。
数列 a_n = 1 + (1)/(4) + (1)/(9) + ... + (1)/(n^2) (部分和)。最初の5項を書け。
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