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nguyenquocvietcqt
2 năm trước
Cho tam giác ABC cân tại A, các đường trung tuyến BD và CE cắt nhau tại G: a) Chứng minh: AG là phân giác của góc A b) Lấy điểm I trên đoạn GC / GI=GE. Gọi K là trung điểm của AG. Chứng minh rằng: 3 đường thẳng BD, AI, CK đồng quy
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