如图,在△ABC中,AB=AC,∠A=120°.AB的垂直平分线MN分别交BC,AB与点M.N求证CM=2BM
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![如图,在△ABC中,AB=AC,∠A=120°.AB的垂直平分线MN分别交BC,AB与点M.N求证CM=2BM](/uploads/image/z/3780289-1-9.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2CAB%3DAC%2C%E2%88%A0A%3D120%C2%B0.AB%E7%9A%84%E5%9E%82%E7%9B%B4%E5%B9%B3%E5%88%86%E7%BA%BFMN%E5%88%86%E5%88%AB%E4%BA%A4BC%2CAB%E4%B8%8E%E7%82%B9M.N%E6%B1%82%E8%AF%81CM%3D2BM)
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