A piece of iron wire, its (1/4) is used for the first time, and its (1/3) is used for the second time, what fraction of the total length is left?
一根铁丝，第一次用去它的(1/4)，第二次用去它的(1/3)，还剩下全长的几分之几？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">1 - (1/4) - (1/3)</gadget>
<output>5/12 = around 0.416667</output>

<result>5/12 = around 0.416667</result>