The product of x and (2/5) is equal to the product of (1/7) and (1/2).
x与(2/5)的积等于(1/7)与(1/2)的积．
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/7) * (1/2)</gadget>
<output>1/14 = around 0.071429</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(1/14) / (2/5)</gadget>
<output>5/28 = around 0.178571</output>

<result>5/28 = around 0.178571</result>