piece of wood with a length of 4 meters is sawed into small sections of the same length, and the sawing is done 6 times. Each section accounts for ((())/(())) of the total length. How many meters is each section long?
把一根4米长的木料，锯成每段一样长的小段，锯了6次，每段占全长的((())/(()))，每段长多少米．
<gadget id="calculator">6 + 1</gadget>
<output>7</output>

<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">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

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