已知,如图,D是△ABC的BC边的中点,DE
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![已知,如图,D是△ABC的BC边的中点,DE](/uploads/image/f/4201639-7-9.jpg?t=%E5%B7%B2%E7%9F%A5%2C%E5%A6%82%E5%9B%BE%2CD%E6%98%AF%E2%96%B3ABC%E7%9A%84BC%E8%BE%B9%E7%9A%84%E4%B8%AD%E7%82%B9%2CDE)
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