There is a ribbon long (5/6) meters, (1/3) meter is used for the first time, and (1/4) meter is used for the second time, how many meters are left unused?
有一根彩带长(5/6)米，第一次用去(1/3)米，第二次用去(1/4)米，还有多少米没用完？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

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

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(5/6) - (1/3) - (1/4)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>