A wire is 2 meters long, (2/3) of it is used for the first time, and (1/6) meter is used for the second time, how many meters are left?
一根电线长2米，第一次用去它的(2/3)，第二次又用去(1/6)米，还剩多少米．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

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

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

<gadget id="calculator">2 - (4/3) - (1/6)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>