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quangcaomanhhientd
2 năm trước
Cho tam giác ABC nhọn(AB<AC).Gọi M là trung điểm của BC.Trên tia AM lấy điểm N sao cho M là trung điểm của AN. a,Chưng minh tam giác AMB=tam giác NMC b,Vẽ CD vuông góc AB(D thuộc AB).So sánh góc ABC và góc BCN.Tính góc DCN c, Vẽ AH vuông góc BH (H thuộc BC),trên tia đối của tia HA lấy điểm I sao cho HI=HA. C/m BI=CN
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