Mathematics
Senior High
Ｒ3の座標を求めるのにベクトル使ってちゃんと正しい答え出たんですけど
この程度の問題にしてはちょっと時間かかり過ぎたような気がします……
(答え出すまで15分くらい)
もっと簡単な方法ないでしょうか？
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