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hannguyen191104
2 năm trước
Cho tứ giác ABCD có chu vi là 4a. Gọi E, F, G, H lần lượt là trung điểm AB, BC, CD, DA. Chứng minh rằng trong hai đoạn EG và HF, có một đoạn có độ dài không lớn hơn a.
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