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sadrose497
2 năm trước
cho ΔABC, góc A=90 độ, AB=6cm, AC=12cm. Vẽ đường cao AH ( H thuộc BC) a. CM: ΔHBA đồng dạng ΔABC b. Tính BC, AH, BH c.Vẽ đường phân giác AB của ΔABC (D thuộc BC). Tính BD, DC
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