在△ABC中,∠BAC=120°,AB=2,AC=1,D是边BC上一点,DC=2BD,则 向量AD 点乘向量BC 的值
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![在△ABC中,∠BAC=120°,AB=2,AC=1,D是边BC上一点,DC=2BD,则 向量AD 点乘向量BC 的值](/uploads/image/z/584348-68-8.jpg?t=%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2C%E2%88%A0BAC%3D120%C2%B0%2CAB%3D2%2CAC%3D1%2CD%E6%98%AF%E8%BE%B9BC%E4%B8%8A%E4%B8%80%E7%82%B9%2CDC%3D2BD%2C%E5%88%99+%E5%90%91%E9%87%8FAD+%E7%82%B9%E4%B9%98%E5%90%91%E9%87%8FBC+%E7%9A%84%E5%80%BC)
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