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Kien1518
2 năm trước
CHo tam giác ABC có B > C , kẻ AH vuông BC gọi D là một điểm nằm giữa A và H. CM a) BH < HC b BD < DC 2 Cho tam giác ABC vuông ở A. Trên tia đối của CA lấy E, trên tia đối của AC lấy điểm F sao cho AF = AC. So sánh BC,BF,BE
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