A piece of wood with a length of 5 meters, saw off (1/3) for the first time, saw off the rest (1/2) for the second time, and how much is the remaining length
一根长5米的木料，第一次锯掉(1/3)，第二次锯掉余下的(1/2)，还剩下全长的多少
<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">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(2/3) * (1/2)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3) - (1/3)</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>