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Trên mặt phẳng cho 5 điểm có tọa độ nguyên, trong đó không có ba điểm nào thẳng hàng. Chứng minh rằng trong só các tam giác được tạo thành từ 5 điểm trên, có ít nhất ba tam giác có diện tích nguyên.
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