Mathematics, 16.06.2021 17:30 emilyjanae9961

Cho đường tròn tâm (O, R) và điểm A nằm cố định ngoài đường tròn. Qua A kẻ hai tiếp tuyến AM , AN tới đường tròn .Một đường thẳng (d) qua A, cắt đường tròn tại B, C. Gọi I là trung điểm BC. Đường thẳng qua B, song song với AM cắt MN tại E Chứng minh 5 điểm A, M,O, I,N thuộc cùng 1 đường tròn

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Cho đường tròn tâm (O, R) và điểm A nằm cố định ngoài đường tròn. Qua A kẻ hai tiếp tuyến AM , AN tớ...