Divide a 4-meter-long iron wire into 7 sections on average, how many meters is each section, and each section is 4 meters ((())/(())).
把4米长的铁丝平均分成7段，每段长多少米，每段是4米的((())/(()))．
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">4 * (1/7)</gadget>
<output>4/7 = around 0.571429</output>

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