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設a=(x,y,z) ∵a⊥AB,a⊥AC ∴-2x-y-3z=0,x-3y+2z=0 又x^2+y^2+z^2=3 ∴x=y=z=1或x=y=z=-1 ∴a={1,1,1}或者{-1,-1,-1}
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