Mathematics
Senior High
どうやって計算したら答えまでたどりつけますか？
よって
n-1
an= a₁ + (3k-1)
k=1
1
= 1+3 · (n − 1)n−(n − 1)
2
an
OSIS 0S 088
= 1/2
²_5n+4).ex. f
(3n²_5n+4)
数列
し
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