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2 năm trước
Cho (ABC vuông tại A có AB = 3cm, AC = 4cm. a/ Tính BC. So sánh các góc của tam giác ABC. b/ Từ A kẻ AH vuông góc với BC của (ABC. Trên tia BH lấy điểm D sao cho H là trung điểm của đoạn thẳng BD. Chứng minh (ABD cân tại A. c/ Trên tia AH lấy M sao H là trung điểm AM. Chứng minh : tam giác ABM cân.
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