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kieuthanhlam
2 năm trước
Một thửa đất hình chữ Nhật có chu vi là 180m. Nếu tăng chiều rộng 6m, giảm chiều dài đi 6m thì diện tích thửa đất không đổi. Tính diện tích thửa đất ban đầu.
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