Giải bài tập bằng cách giải hệ phương trình: 1 hình chữ nhật có chu vi là 450 cm. Nếu giảm chiều rộng đi 20%, tằng chiều dài lên 25% thì được hình chữ nhật có chu vi không đổi. Tìm các kích thước của hình chữ nhật Giúp mình giải bài này nha

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