Divide the 3-meter-long iron wire into 7 parts on average. The length of each segment is ((())/(())) of this iron wire. How many meters is the length of 2 segments?
把3米长的铁丝平均分成7份，每段长是这根铁丝的((())/(()))，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">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<result>6/7 = around 0.857143</result>