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hoang2802
2 năm trước
cho tam giác ABC cân tại A có 2 đường trung tuyến BM và CN cắt nhau tại G a)cm: AG là đường trung trực của MN b) giả sử E là trung điểm của BC.cm: A,G,E thẳng hàng c)cho AB=AC=13cm,BC=10cm.tính AG d)cm:MN//BC e)cm:BC< 4BG g)so sánh chu vi của tam giác ABC vơi AE+3BG
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