△ABC内接于以O为圆心,1为半径的圆,且向量3OA+4OB+5OC=O,①求向量OA·OB,OB·OC,OC·OA.②求△ABC的面积.HELP!
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![△ABC内接于以O为圆心,1为半径的圆,且向量3OA+4OB+5OC=O,①求向量OA·OB,OB·OC,OC·OA.②求△ABC的面积.HELP!](/uploads/image/z/3818727-63-7.jpg?t=%E2%96%B3ABC%E5%86%85%E6%8E%A5%E4%BA%8E%E4%BB%A5O%E4%B8%BA%E5%9C%86%E5%BF%83%2C1%E4%B8%BA%E5%8D%8A%E5%BE%84%E7%9A%84%E5%9C%86%2C%E4%B8%94%E5%90%91%E9%87%8F3OA%2B4OB%2B5OC%3DO%2C%E2%91%A0%E6%B1%82%E5%90%91%E9%87%8FOA%C2%B7OB%2COB%C2%B7OC%2COC%C2%B7OA.%E2%91%A1%E6%B1%82%E2%96%B3ABC%E7%9A%84%E9%9D%A2%E7%A7%AF.HELP%21)
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