Mathematics
Senior High
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822 いろいろな数列 49
788 初項から第ヵ 項までの和 ぐ⑨。 が次の式で与えられるとき一般項 。 を求めよ
幼) 5。=ニ72二47 (2) 9。 = よ1 に95語
7の 和 1.1二2.2十3.22二………十・27ー1 を求めよ.
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