如图,在直角梯形ABCD中,AD平行于BC,角B等于90度,角C=45度,AD=1,BC=4,E为AB的中点,EF平行于DC交BC于F,求EF1
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![如图,在直角梯形ABCD中,AD平行于BC,角B等于90度,角C=45度,AD=1,BC=4,E为AB的中点,EF平行于DC交BC于F,求EF1](/uploads/image/z/562601-65-1.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E7%9B%B4%E8%A7%92%E6%A2%AF%E5%BD%A2ABCD%E4%B8%AD%2CAD%E5%B9%B3%E8%A1%8C%E4%BA%8EBC%2C%E8%A7%92B%E7%AD%89%E4%BA%8E90%E5%BA%A6%2C%E8%A7%92C%3D45%E5%BA%A6%2CAD%3D1%2CBC%3D4%2CE%E4%B8%BAAB%E7%9A%84%E4%B8%AD%E7%82%B9%2CEF%E5%B9%B3%E8%A1%8C%E4%BA%8EDC%E4%BA%A4BC%E4%BA%8EF%2C%E6%B1%82EF1)
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