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hanhduyls
2 năm trước
cho /\ vuong tai A có AB = 5cm, AC = 12cm a, Tính BC. b, Trên tia đối của tia AB lấy điểm D sao cho AD=AB .CM /\ ABC=/\ ADC c, Đường thẳng A song^2với BC cắt CD tại E. CM /\ EAC cân d, Gọi F trung là điểm BC.CMR CA,FD,DE đồng quy.
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