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Phuongnguyen811
2 năm trước
cho đường tròn (O;5cm), đường kính AB. lấy C thuộc đường tròn sao cho AC=6cm. kẻ OH vuông góc với AC. qua C vẽ tiếp tuyến của (O) tại C cắt OH tại D. Gọi M là điểm thuộc tia đối của tia CA. Chứng minh MC.MA=MO^2 -AO^2
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