1.如图,AB=DF,AC=DE,BE=FC,求证;∠B=∠F.2.如图,在△ABC中,∠ACB=90°,DE是AB的垂直平分线,∠CAE :∠EAB=4 :1,求∠B的度数.3.已知,△ABC中,AB=AC,D点在AB上,E点在AC的延长线上,且BD=CE,连接DE,交BC于F,求证:DF=
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