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thienminh
2 năm trước
Cho đường tròn (O) đường kính AB = 2R, C là trung điểm của OA và dây MN vuông góc với OA tại C. Gọi K là điểm tùy ý trên cung nhỏ MB, H là giao điểm của AK với MN. a, C/minh: Tứ giác CBHK nội tiếp b, Tính tích AH. AK theo R c, C/minh: Δ B M N là tam giác đều
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