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△ADP∽△MBPよりDP:PB=2:1
DP=DP/(DP+PB)
=BD×{2/(2+1)}

BPの長さはBDの長さの3個分
だからDPはBPの2個分
とりあえずDP:BD=2:(2+1)という考え方

ぴぴ

理解できました!!
回答ありがとうございました!!🌝

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