What is the product of the sum of 4.23 plus 0.72 times the difference of 3 minus 0.84?
4.23加上0.72的和乘以3减去0.84的差，积是多少？
<gadget id="calculator">7.95 * 2.16</gadget>
<output>17.172</output>

<result>17.172</result>