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平行即可,不需要模相等,因為向量是可以平移的,(即平移後可以重合就是相等向量),故如果平行且模相等的話二者就成相等或相反向量了
用這兩點的座標相减. 如A(1,3)B(2,4)那麼向量AB就可以表示成:向量AB=(2-1,4-3)=(1,1) 向量BA就可以表示成:向量BA=(1-2,3-4)=(-1,-1)
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