A 2-meter-long rope is cut off (1/3), how much is left?
一根2米长的绳子截去(1/3)，还剩下多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">2 * (2/3)</gadget>
<output>4/3 = around 1.333333</output>

<result>4/3 = around 1.333333</result>