Mathematics
Senior High
この２つの解き方教えください
問 3.15 次に示す数列の階差数列を作り,階差数列の一般項を推定しなさい。
(1) 3,4,7, 12, 19,28, 39, ·……
(2) 5,6,9, 18, 45, 126,369, ·…
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