Mathematics
Senior High
(3)のシグマの計算の仕方を教えてほしいです。
640. (1) a=1, an+1一an=2n+1
次のように定義される数列の一般項anを求めよ。[640~641]
3
(2) a=3, an+1=an+2-3"ー1
例題107)(1
(3) a=2, an+1=Qntn°+n
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