Bài 1: Cho góc BAx là góc tạo bởi tia tiếp tuyến và dây cung chắn cung nhỏ AB của đường tròn (O), M là một điểm nằm trên cung lớn AB (M khác A và B). Biết góc AMB = 70°. Tính số đo góc BAx.

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