Mathematics
Senior High
Resolved
Snの答えを2枚目のようにしたら間違いですか？
3-1
-(2n-1) 3"-1
Sn
=
(2n-1) 3+1
2
Sn
S
3" (1-2n) - 1
-3n (1+2n) +11
201
Answers
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