如图,在三角形ABC中,角B=2角C,AD垂直BC,M是BC中点.取AB中点为N,连接DN,MN.求证:DM=1/2AB.
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![如图,在三角形ABC中,角B=2角C,AD垂直BC,M是BC中点.取AB中点为N,连接DN,MN.求证:DM=1/2AB.](/uploads/image/z/3137080-40-0.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2C%E8%A7%92B%3D2%E8%A7%92C%2CAD%E5%9E%82%E7%9B%B4BC%2CM%E6%98%AFBC%E4%B8%AD%E7%82%B9.%E5%8F%96AB%E4%B8%AD%E7%82%B9%E4%B8%BAN%2C%E8%BF%9E%E6%8E%A5DN%2CMN.%E6%B1%82%E8%AF%81%EF%BC%9ADM%3D1%2F2AB.)
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