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alexandertran403
2 năm trước
Cho tam giác ABC cân tại A. Trên BC lấy D và E sao cho BD=CE Kẻ Dx vuông góc với AB , kẻ Ey vuông góc với AC , Dx cắt Ey tại H a) CM ΔABE = Δ ACD? b) CM HD=HE? c) gọi O là giao điểm của BD và CE . Khi đó Δ OED là Δ j ? Vì sao? d) CM AO là tia phân giác của góc BAC? e) CM : A , O , H thẳng hàng? ( vẽ hình + giải chi tiết ạ)
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