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nganlovelysmile
2 năm trước
một mảnh đất hình chữ nhật có chu vi 46m.nếu tăng chiều rộng 4m và giảm chiều dài 20phần trăm thì mảnh đất đó thành hình vuông tính diên tích mảnh đất hình chữ nhật đó
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