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nhathien1907
2 năm trước
Cho tam giác ABC cân tại A trên cạnh BC lấy điểm D,E sao cho BD =EC <1/2 BC a) Chứng mình tâm giác ADE là tam giác cân b) Kẻ DH vuông góc với Ab tại H , EK vuông góc với AC tại K . Chứng minh BH=CK c) Gọi I là giao điểm của DH và EK. Chứng minh tam giác IDE cân tại I d) Chứng minh AI là tia phân giác của góc BAC Giúp mình với ạ !!! mình cảm ơn ạ :3 Mình cần gấp lắm ạ !!!!!
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