1.已知向量OP=(2,1),向量0A=(1,7),向量OB=(5,1)设M是直线OP上的一点,O是坐标原点(1)求使MA·MB的最小值是的向量OM(2)对(1)当中的点M,求∠AMB的余弦值.2.已知△ABC的周长为6,|BC||CA||AB|成
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![1.已知向量OP=(2,1),向量0A=(1,7),向量OB=(5,1)设M是直线OP上的一点,O是坐标原点(1)求使MA·MB的最小值是的向量OM(2)对(1)当中的点M,求∠AMB的余弦值.2.已知△ABC的周长为6,|BC||CA||AB|成](/uploads/image/z/1581286-22-6.jpg?t=1.%E5%B7%B2%E7%9F%A5%E5%90%91%E9%87%8FOP%3D%EF%BC%882%2C1%EF%BC%89%2C%E5%90%91%E9%87%8F0A%3D%EF%BC%881%2C7%EF%BC%89%2C%E5%90%91%E9%87%8FOB%3D%EF%BC%885%2C1%EF%BC%89%E8%AE%BEM%E6%98%AF%E7%9B%B4%E7%BA%BFOP%E4%B8%8A%E7%9A%84%E4%B8%80%E7%82%B9%2CO%E6%98%AF%E5%9D%90%E6%A0%87%E5%8E%9F%E7%82%B9%EF%BC%881%EF%BC%89%E6%B1%82%E4%BD%BFMA%C2%B7MB%E7%9A%84%E6%9C%80%E5%B0%8F%E5%80%BC%E6%98%AF%E7%9A%84%E5%90%91%E9%87%8FOM%EF%BC%882%EF%BC%89%E5%AF%B9%EF%BC%881%EF%BC%89%E5%BD%93%E4%B8%AD%E7%9A%84%E7%82%B9M%2C%E6%B1%82%E2%88%A0AMB%E7%9A%84%E4%BD%99%E5%BC%A6%E5%80%BC.2.%E5%B7%B2%E7%9F%A5%E2%96%B3ABC%E7%9A%84%E5%91%A8%E9%95%BF%E4%B8%BA6%2C%7CBC%7C%7CCA%7C%7CAB%7C%E6%88%90)
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