Mathematics
Undergraduate
Ａ(1 0 2) Ｂ(0 2 3) C(1 2 －1)
1、Cから直線ABへの正射影をもとめよ
2、1の正射影(Q)とCを結ぶ線分mの方程式をもとめよ
3、CQの長さをもとめよ
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