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會用行列式嗎?給你一個公式: 設a=(X1,Y1,Z1),b=(X2,Y2,Z2), a×b=(Y1Z2-Y2Z1,Z1X2-Z2X1,X1Y2-X2Y1) (1,2,3)×(4,5,6)=(12-15,12-6,5-8)=(-3,6,-3)
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