Xiao Ming reads a book, he reads the whole book (1/9) on the first day, reads the whole book (1/6) on the second day, and reads the whole book (2/9) on the third day, he reads the whole book in total How much?
小明看一本书，第一天看了全书的(1/9)，第二天看了全书的(1/6)，第三天看了全书的(2/9)，他总共看了全书的多少？
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">(1/9) + (1/6) + (2/9)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>