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thanhhuyen2072001
2 năm trước
Cho nửa đường tròn (O) đường kính CD . Vẽ các tiếp tuyến Cx , Dy . (Cx , Dy và nửa đường tròn (O) thuộc cùng 1 nửa mặt phẳng bờ CD). Lấy điểm M tùy ý trên nửa đường tròn trên . Tiếp tuyến tại M cắt Cx , Dy lần lượt tại A , B . a) Chứng minh ΔOAB vuông tại O b) Chứng minh AB=AC+BD c) Chứng minh CD là tiếp tuyến của đường tròn đường kính AB
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