Mathematics
Senior High
分数の差の形に変形がどうやってそうなったのかがわかりません
数
2
1
1 1
1
1
2.5' 5-8' 8.11' 11.14' 14.17'
ポイント③ 第k項ak を分数の差の形に変形する。
1
1
1
1
(3k-1)(3k+2)
33k-1 3k+2.
ak=
=
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