若点O在△ABC内,则有结论S△OBC×向量OA+S△OAC×向量OB+S△OAB×OC=向量0.如何得证?×(这是个乘号)
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![若点O在△ABC内,则有结论S△OBC×向量OA+S△OAC×向量OB+S△OAB×OC=向量0.如何得证?×(这是个乘号)](/uploads/image/z/8656360-16-0.jpg?t=%E8%8B%A5%E7%82%B9O%E5%9C%A8%E2%96%B3ABC%E5%86%85%2C%E5%88%99%E6%9C%89%E7%BB%93%E8%AE%BAS%E2%96%B3OBC%C3%97%E5%90%91%E9%87%8FOA%2BS%E2%96%B3OAC%C3%97%E5%90%91%E9%87%8FOB%2BS%E2%96%B3OAB%C3%97OC%3D%E5%90%91%E9%87%8F0.%E5%A6%82%E4%BD%95%E5%BE%97%E8%AF%81%3F%C3%97%EF%BC%88%E8%BF%99%E6%98%AF%E4%B8%AA%E4%B9%98%E5%8F%B7%EF%BC%89)
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