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photohoangduc1973
2 năm trước
Cho hai đường tròn (O) và (O') cắt nhau tại hai điểm A và B. Trên đường thẳng AB lấy điểm M ( A nằm giữa M và B). Vẽ đường thẳng MO cắt đường tròn (O) tại C và D. Vẽ đường thẳng MO’ cắt đường tròn (O’) tại E và F. Chứng minh rằng: MC.MD = ME.MF
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