What is the difference between 19.2 and the sum of 8.45 and 0.9?
19.2减去8.45与0.9的和，差是多少？
<gadget id="calculator">8.45 + 0.9</gadget>
<output>9.35</output>

<gadget id="calculator">19.2 - 9.35</gadget>
<output>9.85</output>

<result>9.85</result>