Divide the 2-meter-long iron wire into 7 parts on average, each section is 2 meters long ((())/(())), how many meters is the length of the 2 sections?
把2米长的铁丝平均分成7份，每段长是2米的((())/(()))，2段长多少米．
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

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

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<result>4/7 = around 0.571429</result>