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平面x+2z=1法向量:n1 =(1,0,2) 平面y-3z=2法向量:n2 =(0,1,-3) 又直線l的方向向量s與n1,n2垂直,故: s = n1×n2 =(-2,3,1) l的點法式方程: (x-0)/(-2)=(y-2)/3 =(z-4)/1
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