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nhatqn213
2 năm trước
Cho tam giác ABC vuông tại A có độ dài các cạnh AB = 6cm, AC = 8cm. Vẽ AD là phân giác góc BAC (D BC) a. Tính BC, BD. b. Qua D vẽ DE // AB (E AC), vẽ DF // AC (F AB). Chứng minh: Tứ giác AEDF là hình chữ nhật.
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