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caovanminhkitken9889
2 năm trước
Cho ΔABC vuông tại A; p/giác CD. Gọi H là hình chiếu của điểm B trên dg thẳng CD. Trên tia CD lấy điểm E sao cho H là trung điểm của BE. Gọi F là giao điểm của BH và CA. CMR: a) ^CEB=^ADC; ^EBH=^ACD b) BE vuông góc với BC c) DF vuông góc với DE
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