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2 năm trước
Trên đường tròn (O) lấy ba điểm A, B,C. Gọi D, E, F theo thứ tụ là điểm chính giữa các cung AB (không chứa C), BC (không chứa A) và AC (không chứa B), Gọi G là giao điểm của BF và AE; H là giao của AB với DE; I là giao của BC và AE. Chứng minh rằng: a) BEG là tam giác cân b) HA.EB =HB.EA c) HG // BC d) AE/ BE= AB/ BI
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