Mathematics
Senior High
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青線から赤線になる時の計算教えて欲しいです！
={t+計(せみたい
"
1/2mcnt1){3nen+1)+2(2n+1)9
1
in(n+1)x3m²+7m+2) (ペ
1/2(ntixn+2(3n+1)
S
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ありがとうございます！助かりました！