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Cho tam giác ABC vuông tại A có AB = 3cm, AC = 4cm. a) Tính độ dài cạnh BC. b) Vẽ đường phân giác BD của tam giác ABC (D thuộc AC). Vẽ DE vuông góc BC tại E. Chứng minh tam giác ABD = tam giác EBD
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