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2 năm trước
Bài 2: Cho tam giác ABC có AB=4cm, AC=5cm, BC=6cm. Trên tia đối của tia AB lấy điểm D sao cho AD=AC. a) Chứng minh: ABC đồng dạng CBD b) Tính độ dài đoạn thẳng CD. c) Chứng minh: góc BAC=2 góc ACB
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