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oanhnp
2 năm trước
bài 1 một tam giác ABC có diện tích 120dm* , số có cạnh đáy BC bằng 12dm a: tìm chiều cao hạ từ đỉnh A xuống canh đáy BC của tam giác đó b: nếu kéo dai đáy BC thêm 0,5dm thì diện tích tam giác tăng bao nhiêu dm*
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