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hoahoa26
2 năm trước
cho tam giác ABC có M là trung điểm của BC .N là 1 điểm trong tam giác sao cho NB=NC.Chứng minh a) tam giác NMB = tam giác NMC b) góc MBN = góc MCN c)tam giác ABC cần thêm điều kiện gì để tam giác ABN = tam giác ACN
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