How much more is the result of 19*20 than 19*19
19*20的结果比19*19多多少
<gadget id="calculator">19 * 20</gadget>
<output>380</output>

<gadget id="calculator">19 * 19</gadget>
<output>361</output>

<gadget id="calculator">380 - 361</gadget>
<output>19</output>

<result>19</result>