What is the product of the sum of 40 and 60 and their difference?
40与60的和与它们的差的乘积是多少？
<gadget id="calculator">40 + 60</gadget>
<output>100</output>

<gadget id="calculator">60 - 40</gadget>
<output>20</output>

<gadget id="calculator">100 * 20</gadget>
<output>2_000</output>

<result>2_000</result>