如图,△ABC中,AD为中线,DE⊥AB于E,DF⊥AC于F,AB=3,AC=4,DF=1.5,则DE=______. 如图,△ABC中,AD为中线,DE⊥AB于E,DF⊥AC于F,AB=3,AC=4,DF=1.5,则DE=______. 发布时间:2025-09-06 12:16:39