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chibiquynh
2 năm trước
Cho đường tròn (O ,R ) đường kính AB cố định . Vẽ tiếp tuyến Ax . Trên Ax lấy điểm M bất kì . Gọi C là giao điểm của đoạn MB với ( O,R) , kẻ AD vuông góc với MO c , Đường thẳng qua O song song với AD cắt tia MA tại Q . Tìm vị trí của điểm M trên Ax sao cho diện tích tam giác MOQ min . Tìm giá trị nhỏ nhất theo R
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