Divide (3/7) meter long iron wire into 3 parts on average, how many meters long each part is, and one part accounts for ((())/(())) of the total length.
把(3/7)米长的铁丝平均分成3份，每份长多少米，其中一份占全长的((())/(()))．
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

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

<gadget id="calculator">(3/7) * (1/3)</gadget>
<output>1/7 = around 0.142857</output>

<result>1/7 = around 0.142857</result>