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Cho tam giác ABC (AB <AC) nội tiếp đường tròn (O;R). Lấy điểm M thuộc cung BC không chứa điểm A sao cho cung MB nhỏ hơn cung MC (M không trùng B). Gọi H, I, K lần lượt là hình chiếu của điểm M trên các đường thẳng AB, BC, AC. 1/ Chứng minh: Tứ giác MHBI và tứ giác MIKC là các tứ giác nội tiếp. 2/ Chứng minh: MA.MI = MH. MC 3/ Chứng minh: ba điểm H, I, K thẳng hàng và AB/MH + AC/MK = BC/MI Mn jup mik bai nay voi
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