Mathematics
Senior High
Resolved
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よろしくお願いします
次の問いに答えよ。
(1) 数列 1･3, 2･4, 3･5,......, n(n+2) の第k項をkの式で表せ。
(2) 和 1・3+2・++・・・・・・ n(n+2)を求めよ。
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