如图,在直角梯形ABCD中,AD//BC,∠ABC=90°,AB=2DC,对角线AC⊥BD于F,过点F作EF//AB,交AD于E,CF=4cm.(1) 证明:四边形ABEF是等腰梯形(2) 求AE的长.是AB//DC
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![如图,在直角梯形ABCD中,AD//BC,∠ABC=90°,AB=2DC,对角线AC⊥BD于F,过点F作EF//AB,交AD于E,CF=4cm.(1) 证明:四边形ABEF是等腰梯形(2) 求AE的长.是AB//DC](/uploads/image/z/473508-36-8.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%2F%2FBC%2C%E2%88%A0ABC%3D90%C2%B0%2CAB%3D2DC%2C%E5%AF%B9%E8%A7%92%E7%BA%BFAC%E2%8A%A5BD%E4%BA%8EF%2C%E8%BF%87%E7%82%B9F%E4%BD%9CEF%2F%2FAB%2C%E4%BA%A4AD%E4%BA%8EE%2CCF%3D4cm.%EF%BC%881%EF%BC%89+%E8%AF%81%E6%98%8E%EF%BC%9A%E5%9B%9B%E8%BE%B9%E5%BD%A2ABEF%E6%98%AF%E7%AD%89%E8%85%B0%E6%A2%AF%E5%BD%A2%EF%BC%882%EF%BC%89+%E6%B1%82AE%E7%9A%84%E9%95%BF.%E6%98%AFAB%2F%2FDC)
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