A 3-meter-long steel pipe, after cutting off (1/2) meter, what is left is the total length.
一根3米长的钢管，截去(1/2)米后，剩下的是全长的多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3 - (1/2)</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">(5/2) / 3</gadget>
<output>5/6 = around 0.833333</output>

<result>5/6 = around 0.833333</result>