正方形ABCD的边长为1,E在CD上,F在射线AD上,DF为x(1)当BE=BF,S△BEF=y,求y关于x的解析式及定义域(已解出)(2)若△BEF为RT三角形,求DF的长(3)DE=1/4,直线EF交直线BC于G,△BEG为等腰△,求DF的长2、3
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![正方形ABCD的边长为1,E在CD上,F在射线AD上,DF为x(1)当BE=BF,S△BEF=y,求y关于x的解析式及定义域(已解出)(2)若△BEF为RT三角形,求DF的长(3)DE=1/4,直线EF交直线BC于G,△BEG为等腰△,求DF的长2、3](/uploads/image/z/3960451-19-1.jpg?t=%E6%AD%A3%E6%96%B9%E5%BD%A2ABCD%E7%9A%84%E8%BE%B9%E9%95%BF%E4%B8%BA1%2CE%E5%9C%A8CD%E4%B8%8A%2CF%E5%9C%A8%E5%B0%84%E7%BA%BFAD%E4%B8%8A%2CDF%E4%B8%BAx%EF%BC%881%EF%BC%89%E5%BD%93BE%3DBF%2CS%E2%96%B3BEF%3Dy%2C%E6%B1%82y%E5%85%B3%E4%BA%8Ex%E7%9A%84%E8%A7%A3%E6%9E%90%E5%BC%8F%E5%8F%8A%E5%AE%9A%E4%B9%89%E5%9F%9F%EF%BC%88%E5%B7%B2%E8%A7%A3%E5%87%BA%EF%BC%89%EF%BC%882%EF%BC%89%E8%8B%A5%E2%96%B3BEF%E4%B8%BART%E4%B8%89%E8%A7%92%E5%BD%A2%2C%E6%B1%82DF%E7%9A%84%E9%95%BF%EF%BC%883%EF%BC%89DE%3D1%2F4%2C%E7%9B%B4%E7%BA%BFEF%E4%BA%A4%E7%9B%B4%E7%BA%BFBC%E4%BA%8EG%2C%E2%96%B3BEG%E4%B8%BA%E7%AD%89%E8%85%B0%E2%96%B3%2C%E6%B1%82DF%E7%9A%84%E9%95%BF2%E3%80%813)
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