Divide (3/7) meter wire into 3 parts on average, the length of each part is how many meters, and the third part accounts for ((())/(())) of the total length.
把(3/7)米铁丝平均分成3份，每份长多少米，第三份占全长的((())/(()))．
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

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

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