For a 4-meter-long iron wire, use up (1/3) meter, how many meters of iron wire are left, and what is the correct formula
4米长的铁丝，用去(1/3)米，求剩下多少米铁丝，正确算式是多少
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">4 - (1/3)</gadget>
<output>11/3 = around 3.666667</output>

<result>11/3 = around 3.666667</result>