Divide a 4-meter-long iron wire into 7 sections on average, and the length of each section is the length of the iron wire.
把一根4米长的铁丝平均分成7段，每段长是这根铁丝的多少．
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

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