A 3-meter-long rope, first cut off (3/5), and then cut off 0.5 meters, how many meters are left.
一根3米长的绳子，先截去它的(3/5)，再截去0.5米，还剩下多少米．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">3 * (3/5)</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">3 - (9/5) - 0.5</gadget>
<output>0.7</output>

<result>0.7</result>