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phanhoangtai15042001
2 năm trước
cho tam giác ABC vg tại A .đg tròn tâm O đường kình AB cắt BC tại D a, cm AC .AC= CD .BC b, gọi I là trung điểm của BD .Tiếp tuyến tại D cắt AC ở M cát OI tại N .CM rằng MB là tiếp tuyến của đg tròn tâm o c, OM cắt AD ở K .cm OK.OM=OI.ON
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