Mathematics
Senior High
大至急！
教えてください！
お願いします！
ANT W
α に点P(5, -6, 9) から垂線PH
平面
[中央大]
3点 (1,2,2),(3,1,-3), (-5, -3, 1) を通る
を下ろすとき, 点H の座標とPHの長さを求めよ.
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