Xiao Ming reads a book, he reads (2/3) of the whole book on the first day, and reads (1/3) of the first day on the second day, what percentage of the book is left unread?
小明看一本书，第一天看了全书的(2/3)，第二天看的是第一天的(1/3)，还剩这本书的几分之几没有看？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

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

<gadget id="calculator">(2/3) * (1/3)</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">1 - (2/3) - (2/9)</gadget>
<output>1/9 = around 0.111111</output>

<result>1/9 = around 0.111111</result>