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486860835236416
2 năm trước
cho tam giác ABC có M,N,P lần lượt là trung điểm AB,AC,BC. CMR với 1 điểm O tùy ý ta có: vecto OA + vecto OC + vecto OC = vecto OM + vecto ON + vecto OP (ko cần vẽ hình)
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