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dungphuc21022006
2 năm trước
Cho tam giác ABC cân tại A có AM là phân giác. a/ So sánh MB và MC. b/ Chứng minh AM vuông góc với BC c/ Trên tia AM lấy điểm D sao cho M là trung điểm AD. Tam giác ACD là tam giác gì? d/ Trên tia đối của tia CB lấy điểm N sao cho CN = CB. Gọi I là giao điểm của DC với AN. Chứng minh I là trung điểm của AN
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