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Cho tam giác ABC cân tại A, góc A< 90 độ . Kẻ BD vuông góc AC tại D, EC vuông góc AB tại E. Gọi I là giao điểm của CD và BE. a) Biết AB = 15cm, AE = 9cm. Tính EC? b) Chứng minh:BD = CE
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