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AB→ = b→ で
BD:AD=1:3 なのでAB:AD=2:3
AD = (3/2)AB だから
AD→ = (3/2)AB→ = (3/2)b→

トトロ

後半も
AB→ = b→、 AC→ = c→ を分子に代入

moe

おかげさまで解決しました!ありがとうございます😭

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