Xiao Ming reads a story book, read this book on the first day (2/9), read this book on the second day (5/9), and read less of the book on the third day than the previous two days ( 4/9), how much did you watch on the third day?
小明看一本故事书，第一天看了这本书的(2/9)，第二天看了这本书的(5/9)，第三天看的比前两天少全书的(4/9)，第三天看了多少？
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(5/9) - (4/9)</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">(2/9) + (1/9)</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>