条件 在 三角形ABC中,∠A=90° ,D在BC上一点,DG平行AC交AB于H点,且DG=DB,DE垂直BG于点E,DE交AB于F点问1 求证 BG=2BE2当AB=3AC时,求DF比BE的值是多少?
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![条件 在 三角形ABC中,∠A=90° ,D在BC上一点,DG平行AC交AB于H点,且DG=DB,DE垂直BG于点E,DE交AB于F点问1 求证 BG=2BE2当AB=3AC时,求DF比BE的值是多少?](/uploads/image/z/12489824-56-4.jpg?t=%E6%9D%A1%E4%BB%B6+%E5%9C%A8+%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2C%E2%88%A0A%3D90%C2%B0+%2CD%E5%9C%A8BC%E4%B8%8A%E4%B8%80%E7%82%B9%2CDG%E5%B9%B3%E8%A1%8CAC%E4%BA%A4AB%E4%BA%8EH%E7%82%B9%2C%E4%B8%94DG%3DDB%2CDE%E5%9E%82%E7%9B%B4BG%E4%BA%8E%E7%82%B9E%2CDE%E4%BA%A4AB%E4%BA%8EF%E7%82%B9%E9%97%AE1+%E6%B1%82%E8%AF%81+BG%3D2BE2%E5%BD%93AB%3D3AC%E6%97%B6%2C%E6%B1%82DF%E6%AF%94BE%E7%9A%84%E5%80%BC%E6%98%AF%E5%A4%9A%E5%B0%91%3F)
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