Cut the 4-meter-long iron wire into 5 sections of the same length, each section accounts for ((())/(())) of the total length, how many meters is each section long?
把4米长的铁丝截成同样长的5段，每段占全长的((())/(()))，每段长多少米．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / (1/5)</gadget>
<output>5</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>