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設向量a叉乘向量b等於向量c 那麼有向量c的大小=向量a的大小*向量b的大小* sin 向量c垂直於向量a和向量b,即垂直於向量a和向量b决定的平面 向量c的方向用右手螺旋判定,即四指由向量a掃向向量b(掃過
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