What is the quotient of the product of (1/4) and (1/7) divided by the difference between 1 and (1/4)?
(1/4)与(1/7)的积除以1与(1/4)的差，商是多少？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(1/4) * (1/7)</gadget>
<output>1/28 = around 0.035714</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(1/28) / (3/4)</gadget>
<output>1/21 = around 0.047619</output>

<result>1/21 = around 0.047619</result>