Mathematics
Senior High
Resolved
なぜ赤い線のところを計算すると青い線になるのですか？？教えてください🙇♀️🙏
n-1
ana₁+2=5+
2(2-1-1) s
--I
(I k=1
すなわち an=2"+3
2-1
S=
PP
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分かりました！！ありがとうございます！！