如图,已知在△中,DE平行AC,DF平行AB,BC=5,设△ABC的面积为S,四边形AEDF的面积为2/5S,求:(1)BD的长(2)若AC=根号2AB,且DF经过△ABC的重心时EF的长
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![如图,已知在△中,DE平行AC,DF平行AB,BC=5,设△ABC的面积为S,四边形AEDF的面积为2/5S,求:(1)BD的长(2)若AC=根号2AB,且DF经过△ABC的重心时EF的长](/uploads/image/z/14744448-0-8.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%B7%B2%E7%9F%A5%E5%9C%A8%E2%96%B3%E4%B8%AD%2CDE%E5%B9%B3%E8%A1%8CAC%2CDF%E5%B9%B3%E8%A1%8CAB%2CBC%3D5%2C%E8%AE%BE%E2%96%B3ABC%E7%9A%84%E9%9D%A2%E7%A7%AF%E4%B8%BAS%2C%E5%9B%9B%E8%BE%B9%E5%BD%A2AEDF%E7%9A%84%E9%9D%A2%E7%A7%AF%E4%B8%BA2%2F5S%2C%E6%B1%82%EF%BC%9A%EF%BC%881%EF%BC%89BD%E7%9A%84%E9%95%BF%EF%BC%882%EF%BC%89%E8%8B%A5AC%3D%E6%A0%B9%E5%8F%B72AB%2C%E4%B8%94DF%E7%BB%8F%E8%BF%87%E2%96%B3ABC%E7%9A%84%E9%87%8D%E5%BF%83%E6%97%B6EF%E7%9A%84%E9%95%BF)
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