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AD是△ABC的中線.理由如下:∵BE⊥AD,CF⊥AD,∴∠BED=∠CFD=90°,在△BDE和△CDF中,∠BED= ;∠CFD∠BDE=∠CDFBE=CF∴△BDE≌△CDF(AAS),∴BD=CD.∴AD是△ABC的中線.
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