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nganwinner14701
2 năm trước
Câu 5:Cho∆ ABC cân tại A. Trên cạnh BC lấy hai điểm D và E sao cho BD = CE và BD < .1/2 BC a.Chứng minh ∆ ADE cân b. Kẻ BM AE, CN AD( M ∈ AE, N∈ AD). Chứng minh rằng BM = CN. c.Chứng minh: AM = AN d. Gọi O là giao điểm của BM và CN, biết OM = 1cm, OA = 3cm. Tính AN them hinh nhanh nhe
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