What is the difference between 20 minus the product of 2.56 and 0.6?
20减去2.56与0.6的积，差是多少？
<gadget id="calculator">2.56 * 0.6</gadget>
<output>1.536</output>

<gadget id="calculator">20 - 1.536</gadget>
<output>18.464</output>

<result>18.464</result>