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huong139
2 năm trước
tam giác ABC cân tại A,phân giác AD.N là trung điểm của CD.Vẽ điểm M sao cho N là trung điểm của AM. a) chứng minh tam giác AND=tam giác MCN b)chứng minh CM vuông góc với BC c)Gọi K là trung điểmcủa BM.chứng minh:A,D,K thẳng hàng mong mn giải giúp mình!
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