如图,△ABC中,∠A=90,AB=AC,D为BC的中点,∠EDF=90,BE=3,FC=4,求EF的长度.
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![如图,△ABC中,∠A=90,AB=AC,D为BC的中点,∠EDF=90,BE=3,FC=4,求EF的长度.](/uploads/image/z/5342891-59-1.jpg?t=%E5%A6%82%E5%9B%BE%2C%E2%96%B3ABC%E4%B8%AD%2C%E2%88%A0A%3D90%2CAB%3DAC%2CD%E4%B8%BABC%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E2%88%A0EDF%3D90%2CBE%3D3%2CFC%3D4%2C%E6%B1%82EF%E7%9A%84%E9%95%BF%E5%BA%A6.)
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