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PC・PD=2
PCとPDはそれぞれ
PC=OC-OP
PD=OD+OP
とあらわせるので
(OC-OP) (OD+OP)=2
OC=OD=3より
(3-OP) (3+OP)=2
あとは画像の通りです

ありがとうございます😭😭🙏🏻

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