Xiao Ming reads a story book. He reads (2/9) of this book on the first day, (5/9) of this book on the second day, and finishes it in the remaining three days. How much of the whole book did you read 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)，剩下的三天看完．第三天看了全书的几分之几？
<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">1 - (2/9) - (5/9)</gadget>
<output>2/9 = around 0.222222</output>

<result>2/9 = around 0.222222</result>