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△ADC≌△BDF,理由如下:∵AD⊥BC,BE⊥AC,∴∠ADC=∠BEC=90°,∴∠CBE=∠CAD,在△ADC和△BDF中,∠CAD=∠CBEAD=BD∠ADC=∠BDF,∴△ADC≌△BDF(ASA).
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