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(2)直線lをもとめてy=-x+12 Qのy座標はPと等しいからy=x^2/2のxにtを代入し、t^2/2 つまりQのy座標はt^2/2
これを直線lに代入してQ(-t^2/2+12,t^2/2)

レイ

理解できました!
ありがとうございます!

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