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quanghuedd
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)    Chứng minh BE = DC b)    Gọi O là giao điểm BE và DC. Chứng minh tam giác OBC bằng tam giác ODE. c)    Vẽ trung điểm M của CE. Chứng minh AM là đường trung trực của CE.
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