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Bài 3: Cho tam giác ABC vuông tại A, đường cao AH, có AB= 6cm. AC =8cm a) Tính BC và AH b) Kẻ HE⊥AB tại E; HF⊥AC tại F. Chứng minh EF2 = AF. FC c) Gọi M, N lần lượt là trung điểm của BH, CH . Tính diện tích tứ giác MNEF
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