giải bài toán bằng cách lập hệ phương trình: Một miếng đất hình chữ nhật có chu vi là 76m. Nếu chiều dài miếng đất giảm đi 3m và chiều rộng miếng đất tăng 3m thì miếng đất hình chữ nhật đó trở thành hình vuông. Tính kích thước các cạnh của miếng đất ban đầu

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