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dangoanh123
2 năm trước
cho tam giác ABC cân tại A . Đường cao BD và CE giao nhau tại H. a, cm tam giác ABD = tam giác ACE b, Tam giác BHC cân c, so sánh HB và HC d, trên tia đối EH lấy N sao cho NH < HC , trên tia đối tia DE lấy M sao cho MH = NH . cm BN , AH , CM đồng quy
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