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linhham082004
2 năm trước
Cho tam giác ABC vuông tại A. AB/BC=4/5 và AC=18.Vẽ phân giác BD.Trên AB lấy H sao cho AH/AB=1/3, từ B vẽ đường thẳng vuông góc HC tại E, BE cắt AC tại F a)Tính AD,DC b)cm: tam giác HAC đồng dạng tam giác HEB
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