The school library buys a batch of books, among which (2/9) are story books, (3/9) are literature and art books, and the rest are science and technology books. What percentage of the books are science and technology books?
学校图书室购进一批书，其中(2/9)是故事书，(3/9)是文艺书，其余是科技书，科技书占这批书的几分之几？
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">3 / 9</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (2/9) - (1/3)</gadget>
<output>4/9 = around 0.444444</output>

<result>4/9 = around 0.444444</result>