如图已知d是 abc的bc边的中点de⊥acdf⊥ab垂足分别为ef且df=de则 abc是等腰三角形吗请说明理由.——青夏 Template




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tomski如图已知d是 abc的bc边的中点de⊥acdf⊥ab垂足分别为ef且df=de则 abc是等腰三角形吗请说明理由.——青夏 coloring