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phamductiep987
2 năm trước
cho tam giác cân abc [ab=ac] vẽ đường cao BH và CK M là điểm chính giữa cạnh AB trên\ AC kéo dài về phía C lấy điểm N sao cho NC =1/3NA đoạn MN cắt BC tại e a so sánh độ dài hai đoạn BH và CK b tích diện tích tam giác BCN biết diện tích tam giác ABC bằng 2011 cm2 c Chứng minh rằng ME=NE
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