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ongmattroi42
2 năm trước
Cho tam giác ABC VUÔNG TẠI A, AB = 3cm, AC = 4 cm a, Tính BC b) trên tia đối của AB lấy điểm M sao cho AM = AC. Trên tia đối của tia AC lấy điểm N sao cho AN = AB. CMR : Tam giác BIN cân
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