[中學] 單邊的箭嘴是向量,那雙邊的是什麼?
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向量=單邊箭嘴 AB
我想問
←─
1.雙邊箭頭 AB
/_____\
2.雙向箭嘴 AB
←→
3.雙向箭頭 AB
分別是代表什麼意思呢?
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To protect the peace of the World..."
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