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FとCのy座標が同じことを利用してmを求める
Cの座標は(3)の答えを利用。
Fのx座標はBCの長さはEFの2倍という条件でわかる
D(8/3, 64/9)

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https://www.clearnotebooks.com/ja/questions/1562360

同じ問題の質問来てる
模範解答ついてるので参考に。

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