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letrongthanh11052003
2 năm trước
cho tam giác abc , trên nửa mặt phẳng bờ ac ko chứa b lấy d bất kỳ . gọi m,n,p,q lần lượt là trưng điểm của ab , bc , cd , ad. cmr a, mn song song pq và mq song song np b, mn + np + pq + mq = ac + bd
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