如图 △ABC中 ,∠C=60° AD⊥BC于D BE⊥AC于E,M为AB的中点,N为DE的中点.(1)求证MN⊥DE(2)求MN:DE的值
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![如图 △ABC中 ,∠C=60° AD⊥BC于D BE⊥AC于E,M为AB的中点,N为DE的中点.(1)求证MN⊥DE(2)求MN:DE的值](/uploads/image/z/3152493-45-3.jpg?t=%E5%A6%82%E5%9B%BE+%E2%96%B3ABC%E4%B8%AD+%2C%E2%88%A0C%3D60%C2%B0+AD%E2%8A%A5BC%E4%BA%8ED+BE%E2%8A%A5AC%E4%BA%8EE%2CM%E4%B8%BAAB%E7%9A%84%E4%B8%AD%E7%82%B9%2CN%E4%B8%BADE%E7%9A%84%E4%B8%AD%E7%82%B9.%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%81MN%E2%8A%A5DE%EF%BC%882%EF%BC%89%E6%B1%82MN%3ADE%E7%9A%84%E5%80%BC)
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