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DuongTrong
2 năm trước
Cho tam giác ABC vuông cân tại A. Trên các cạnh AB và AC lần lượt lấy các điểm F và D sao cho AF=AD. Từ A và F vẽ các đường vuông góc với BD, chúng cắt BC lần lượt tạo M và N. Chứng minh rằng: AM = BD+FN/2.
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