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dctrong24
2 năm trước
Cho ABC nhọn (AB < AC). Gọi M là trung điểm của BC. Trên tia AM lấy đi ểm N sao cho M là trung điểm của AN. a)Chứng minh: ΔAMB = ΔNMC b)Vẽ CD vuông AB (D thuộc AB). So sánh góc ABC và góc BCN. Tính góc DCN. c)Vẽ AH vuông BC (H thuộc BC), trên tia đối của tia HA lấy điểm I sao cho HI = HA.Chứng minh: BI = CN, tam giác MIN cân ai giúp nhanh, dễ hiểu me cho 5 sao, hay nhất và 1cảm ơn
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