Saw a 5-meter-long steel bar into 7 small sections of the same length, each section accounts for ((())/(())) of the total length, how many meters is each section long?
把5米长的钢筋，锯成同样长的7小段，每段占全长的((())/(()))，每段长多少米．
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 / (1/7) / 1</gadget>
<output>7</output>

<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<result>5/7 = around 0.714286</result>