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quaq.2k
2 năm trước
Cho tam giác ABC, trên cạnh AB lấy hai điểm D và E sao cho AD=BE (E nằm giữa B và D), từ D và E kẻ DH và EK song song với BC (H,K thuộc AC). Chứng minh rằng DH+EK=BC.
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