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nguyendaidc
2 năm trước
Cho ABC cân tại A có A = 40◦ . Đường trung trực của AB cắt BC ở D. a) Tính CAD . b) Trên tia đối của tia AD lấy điểm M sao cho AM = CD. Chứng minh BMD là tam giác cân.
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