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顯然過點(0,2,4)且平行於兩平面的交線的直線滿足要求 兩平面的法向量為:(1,0,2)、(0,1,-3) 兩平面的交線的方向向量為:(1,0,2)×(0,1,-3)=(-2,3,1) 過點(0,2,4)且平行於兩平面的交線的直線:x/(-2)=(y-2)/3=z-4.
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