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loga1962
2 năm trước
Cho tam giác ABC, gọi D là trung điểm của cạnh AB. Đường thẳng đi qua D và song2 vs BC cắt AC ở M. Gọi E là trung điểm của đoạn thẳng AM. Trên tia đối của tia ED lấy điểm K sao cho EK=ED.KM cắt BC ở N. a) Chứng minh: tam giác AED= tam giác MEK và MK//AD , b) chứng minh: tam giác DMN= tam giác NBD , c) chứng minh: DN//AC
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