Fold a 3-meter-long rope in half three times, each section occupies ((())/(())) of the rope, and how many meters is each section of rope.
把一条长为3米的绳子对折三次，每段占这根绳子的((())/(()))，每段绳子长多少米．
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 / (1/8)</gadget>
<output>8</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>