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5. 兩直線L:
[x+y-z+1=0
(2x+y+z=0
12x-y+2z+2=0
L2 :
(3x+y+2z-4=0
T= (1, 1,-1) 812,-1,2) ✓ = (2,1,1)+(3, 1,2)
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