What is the difference between the product of 16 and 1.25 minus the sum of 2.6 and 1.7?
16与1.25的积减去2.6与1.7的和，差是多少？
<gadget id="calculator">16 * 1.25</gadget>
<output>20</output>

<gadget id="calculator">2.6 + 1.7</gadget>
<output>4.3</output>

<gadget id="calculator">20 - 4.3</gadget>
<output>15.7</output>

<result>15.7</result>