If you read (1/3) of a book every day, how many days can you finish it.
一本书，每天看它的(1/3)，多少天可以看完．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / (1/3)</gadget>
<output>3</output>

<result>3</result>