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平行四邊形定則.兩個向量合成時,以表示這兩個向量的有向線段為鄰邊作平行四邊形,這兩個鄰邊之間的對角線就代表合向量的大小和方向,這就叫做向量的平行四邊形定則.合向量的頭對一條分向量的頭,合向量的尾對另一條分向量的尾.
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