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的確為此在物理中 向量相乘又分為點乘和叉乘向量的乘法有兩種,分別稱為內積和外積. 內積也稱數量積,因為其結果為一個數(標量) 向量a,b的內積為|a|*|b|cos,其中表示a與b的夾角 向量外積也叫叉乘,其結果為一個向量,方向是按右手系垂直與a,b所在平面|a|*|b|sin
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