A 3-meter-long steel pipe is sawed into equal small pieces, sawed 4 times, each section is the full length ((())/(())), how many meters is each section long.
把3米长的钢管锯成相等小段，锯了4次，每段是全长的((())/(()))，每段长多少米．
<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<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">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>