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ngoctamle
2 năm trước
cho tam giác ABC gọi M,N lần lượt là trung điểm AB và AC a) tứ giác BMNC là hình gì? Vì sao b) trên tia đối NM xá định điểm E sao cho NE=NM Tứ giác AECM là hình gì? vì sao
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