A rope, the first use of the full length (1/3), the second use of the first time (1/2), what fraction of the total length is used for the two times? What fraction of the full length is left?
一根绳子，第一次用去全长的(1/3)，第二次用去的是第一次的(1/2)，两次共用去全长的几分之几？还剩下全长的几分之几？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/3) * (1/2)</gadget>
<output>1/6 = around 0.166667</output>

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

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

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