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phananhhanoi308
2 năm trước
cho tam giác ABC gọi M,N lần lượt là trung điểm của BC,AC gọi h là điểm đối xứng của N qua M a) chứng minh BNCH và ABHN là hình bình hành b) tam giác thỏa mãn điều kiện gì thì tứ giác BCNH là hình chữ nhật ai giúp e vs ạ
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