Divide a silk thread with a length of (2/5) meters into 3 parts on average, the length of each part is ((())/(())) of this thread.
把一条长(2/5)米的丝线平均分成3份，每份长多少米，是这条丝线的((())/(()))．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) / 3</gadget>
<output>2/15 = around 0.133333</output>

<result>2/15 = around 0.133333</result>