Mathematics
Senior High
こちらの式の計算のやり方がわかりません。教えてください！！
- 2Sn
て
=
=
32-1
3-1
Sn =
F
3n-1-2n 3n
2
JH
—(2n-1) 3"-1
2
-n• 3n
●
(2n-1) 3+1
4
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