A 6-meter-long rope, after (5/6) is used up, and (1/6) is used up, how many meters are left?
6米长的绳子，用去(5/6)后，又用去(1/6)，还剩多少米．
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 - (5/6)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/6)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">6 * (1/6) * (5/6)</gadget>
<output>5/6 = around 0.833333</output>

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