3m long iron wire, how much m is left after (1/3) is used up
3m长的铁丝，用去(1/3)后，还剩多少m
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<result>2</result>