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2 năm trước
Bài 4: Cho tam giác ABC cân tại A có AD là đường phân giác. a) Chứng minh Δ ABD=Δ ACD b) Gọi G là trọng tâm tam giác ABC. Chứng minh ba điểm A, G, D thẳng hàng. c) Tính DG biết AB=13cm,BC=10cm "Đừng làm tắt,pleas"
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