如图1,Rt△ABC中,∩ACB90°,DE是△ABC的中位线,延长DE至F,使EF=DE,连接CF. (1)求证:四边形BDFC是平行四边(2)求当∩A等于多少都市,平行四边形BDFC是菱形(3)连接CD,AF,BF,且BF分别交CD、AC于点O、G,取BG中
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![如图1,Rt△ABC中,∩ACB90°,DE是△ABC的中位线,延长DE至F,使EF=DE,连接CF. (1)求证:四边形BDFC是平行四边(2)求当∩A等于多少都市,平行四边形BDFC是菱形(3)连接CD,AF,BF,且BF分别交CD、AC于点O、G,取BG中](/uploads/image/z/7010961-33-1.jpg?t=%E5%A6%82%E5%9B%BE1%2CRt%E2%96%B3ABC%E4%B8%AD%2C%E2%88%A9ACB90%C2%B0%2CDE%E6%98%AF%E2%96%B3ABC%E7%9A%84%E4%B8%AD%E4%BD%8D%E7%BA%BF%2C%E5%BB%B6%E9%95%BFDE%E8%87%B3F%2C%E4%BD%BFEF%3DDE%2C%E8%BF%9E%E6%8E%A5CF.+%281%29%E6%B1%82%E8%AF%81%EF%BC%9A%E5%9B%9B%E8%BE%B9%E5%BD%A2BDFC%E6%98%AF%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%282%29%E6%B1%82%E5%BD%93%E2%88%A9A%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91%E9%83%BD%E5%B8%82%2C%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2BDFC%E6%98%AF%E8%8F%B1%E5%BD%A2%EF%BC%883%EF%BC%89%E8%BF%9E%E6%8E%A5CD%2CAF%2CBF%2C%E4%B8%94BF%E5%88%86%E5%88%AB%E4%BA%A4CD%E3%80%81AC%E4%BA%8E%E7%82%B9O%E3%80%81G%2C%E5%8F%96BG%E4%B8%AD)
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