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nguyenhoangcattuong2007
2 năm trước
( O ; 6cm ) ; A nằm bên ngoài (O) Qua A kẻ tiếp tuyến Ax , trên Ax lấy điểm B sao cho AB = 8cm a.Tính OB b.Qua A kẻ đường thẳng vuông góc với OB cắt ( O) ở C .Chứng minh BC là tiếp tuyến của (O)
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