一到希望杯试题 As shown in the figure 25,in△ABC we have AB=BC=CA,DF⊥AC,DE⊥AB.Please compare themagnitudes of the perimeter of △AEF and the perimeter of quadrilataral EBCF中文大意: 在正△ABC中 AB=BC=CA,BC上有一点D,DE⊥AB,

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