What is the difference between 7.8 minus the product of 2.4 and 0.5?
7.8减去2.4与0.5的积，差是多少？
<gadget id="calculator">2.4 * 0.5</gadget>
<output>1.2</output>

<gadget id="calculator">7.8 - 1.2</gadget>
<output>6.6</output>

<result>6.6</result>