如图：在△ABC中,角ACB=90°,AC=BC,AE是BC的中线,过点C作CF⊥AE与F,过B作BD⊥CB交CF的延长线与点D.（1）求证：AE=CD (2)若BD=5cm,求AC的长http://b10.photo.store.qq.com/http_imgload.cgi?/rurl4_b=e258ee62b71d5218bb7daa0baa42a8
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