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hoangphuckh1996
2 năm trước
cho nửa đường tròn (O;R) đường kính AB. trên đoạn OB lấy điểm H sao cho HB=2HO.đường thẳng vuông góc với ab tại h cắt nửa(O) tại D. Vẽ đường tròn (S) đường kính AO cắt AD tại C. a) Chứng minh : c là trung điểm AD b) Chứng minh: bốn điểm C, D, H, O cùng thuộc 1 đường tròn c) CB cắt Do tại E cm bc là đường tiếp tuyến của (s) d) tính diện tích tam giác AEB theo r
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