After (2/3) of the 3-meter-long iron wire is used up, (1/3) meter is used up, how many meters are left?
3米长的铁丝用去(2/3)后，又用去(1/3)米，还剩多少米．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">3 * (2/3)</gadget>
<output>2</output>

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

<gadget id="calculator">3 - 2 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>