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lananhdlwr
1 năm trước
Cho ΔABC vuông tại A,BD là phân giác góc ABC,D ∈AC.Trên cạnh BC lấy điểm E sao cho BA=BE 1) Cm DE ⊥BC 2)Cm BD là đường trung trực của AE 3)Cho AB=3cm,BD=5cm.Tính DE 4)Trên tia đối của tia AB lấy điểm K sao cho AK=CE.Cm 3 điểm K,D,E thẳng hàng 5) ΔBKC là tam giác gì? ΔABC cần thêm điều kiện gì để ΔBKC đều 6)Gọi H là trung điểm của KC.Cm 3 điểm B,H,D thẳng hàng 7)Cm AE song song KC 8)Kẻ AH1 ⊥BC.Cm AE là phân giác của ∠CAH1 9) ΔABC cần thêm điều kiện gì để H1 là trung điểm của BC Ai giải giúp em câu 8,9 vs ạ,em hứa sẽ vote 5 sao ạ!
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