For a 5-meter-long rope, (1/3) of it is cut off for the first time, and (1/3) meter is cut off for the second time, how many meters are left.
5米长的绳子，第一次截去它的(1/3)，第二次截去(1/3)米，余下多少米．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">5 * (1/3)</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">(5/3) + (1/3)</gadget>
<output>2</output>

<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<result>3</result>