Subtract the product of (1/5) and (1/8) from 1, what is the difference (10/39)?
1减去(1/5)与(1/8)的积，所得差的(10/39)是多少？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/5) * (1/8)</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">1 - (1/40)</gadget>
<output>39/40 = around 0.975</output>

<gadget id="calculator">10 / 39</gadget>
<output>10/39 = around 0.25641</output>

<gadget id="calculator">(39/40) * (10/39)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>