What is the difference between the sum of 99 and 100 multiplied by them?
99与100的和乘它们俩的差是多少？
<gadget id="calculator">99 + 100</gadget>
<output>199</output>

<gadget id="calculator">100 - 99</gadget>
<output>1</output>

<gadget id="calculator">199 * 1</gadget>
<output>199</output>

<result>199</result>