A story book, I read (1/6) on the first day and (2/9) on the second day, how much more did I read on the second day than on the first day?
一本故事书，第一天看了(1/6)，第二天看了(2/9)，第二天比第一天多看了几分之几？
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

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

<gadget id="calculator">(2/9) - (1/6)</gadget>
<output>1/18 = around 0.055556</output>

<result>1/18 = around 0.055556</result>