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phuongoanh1824
2 năm trước
Vẽ góc nhọn xAy . Trên tia ax lấy hai điểm B và C ( B nằm giữa A và C ) Trên tia ay lấy hai điểm D và E sao cho AD =AB ; AE = AC a,cm BE = DC b, Gọi O là giao điểm BE và DC . chứng minh tam giác obc = tam giác obe c, vẽ trung điẻm m của CE chứng minh AM là đường trung trực của CE d, cm 3 điểm A, O, M thẳng hàng có ai giúp mik vs mik đâng cần gấp
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