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把向量外積定義為:a×b = |a|·|b|·Sin.分配律的幾何證明方法很繁瑣,大意是用作圖的方法驗證.有興趣的話請自己參閱參考文獻中的證明.下麵給出代數方法.我們假定已經知道了:1)外積的反對稱性:a×b = - b×…
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