A 6-meter-long rope, first cut off (1/3), then cut off (1/3) meter, how many meters are left.
一根6米长的绳子，先截下(1/3)，再截下(1/3)米，还剩多少米．
<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">6 * (2/3)</gadget>
<output>4</output>

<gadget id="calculator">4 - (1/3)</gadget>
<output>11/3 = around 3.666667</output>

<result>11/3 = around 3.666667</result>