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thanhhang11082008
2 năm trước
Cho tam giác ABC cân tại A có góc A < 900. kẻ BH vuông góc với AC ,CK vuông góc với AC.Gọi O là giao điểm của BH và CK. a, Chứng minh tam giác ABH=Tam giác ACH. b, Tam giác OBC cân. c, Tam giác OBK = tam giác OCK. d, trên nửa mặt phẳng bờ BC không chứa điểm A lấy I sao cho IB=IC.Chứng minh 3 điểm A, O, I thẳng hàng.
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