Mathematics
Senior High
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(2)の解き方を教えてください
答えはan=-3/2n^2+5/2n+1です
5 次の条件によって定まる数列{an} について, a2, 3, a 』 を求め, 一般項も求めよ。
(1) a1=5, an+1=an+4n
(2) a1=2, an+1=an-3n+1
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