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Thanhnutruyenky
2 năm trước
Bài 5: Cho ABC cân tại A có a = 50độ. Kẻ AH⊥ BC. a) C/m AH là phân giác của gócBAC b) Kẻ HM ⊥ AB, HN ⊥ AC. C/m HM = HN c) Lấy điểm E, F sao cho M là trung điểm EH, N là trung điểm HF. Tính góc EAF
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